Harmonization summary
2,067 label-stable codes
- Label changes detected
- 942
- Multiple dataset contexts
- 679
- Unique codes
- 3,394
- Enriched codes in this report
- 0
Praxis Data Lab · Variable History
Variable history and harmonization report.
Review variable definitions, cycle chronology, survey design, laboratory methods, method-change boundaries, detection limits, and evidence-backed harmonization actions.
3,394matching variable codes
14,173 release records across 900 datasets and 12 cycles.
Search scope
Filtered NHANES variable history
Component: Laboratory.
Scientific safeguard
Qualified assessment is authoritative; chronology remains supporting evidence.
Praxis separates source-stated method or instrument changes from automated differences in CDC/NCHS method text. The qualified harmonization assessment below is the researcher-facing conclusion; method chronology explains the underlying evidence and does not override that adjudication.
Variable-by-variable chronology
Qualified harmonization assessment and indexed evidence
Each variable first shows the current qualified assessment used by Study Builder, followed by cycle-specific source evidence and method chronology.
AADBDSPEvidence developing
Bed Space Vacuumed (square inches)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Bed Space Vacuumed (square inches) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Bed Space Vacuumed (square inches) — Allergens - Household Dust (Laboratory)
AADBDTIMEvidence developing
Bed Vacuum Time (seconds)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Bed Vacuum Time (seconds) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Bed Vacuum Time (seconds) — Allergens - Household Dust (Laboratory)
AADBDTYPEvidence developing
Type of Bed
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Type of Bed — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Type of Bed — Allergens - Household Dust (Laboratory)
AADEXSTSEvidence developing
Status of Dust Allergen Data
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Status of Dust Allergen Data — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Status of Dust Allergen Data — Allergens - Household Dust (Laboratory)
AADFLSPEvidence developing
Floor Space Vacuumed (square inches)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Floor Space Vacuumed (square inches) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Floor Space Vacuumed (square inches) — Allergens - Household Dust (Laboratory)
AADFLTIMEvidence developing
Floor Vacuum Time (seconds)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Floor Vacuum Time (seconds) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Floor Vacuum Time (seconds) — Allergens - Household Dust (Laboratory)
AADMOVEEvidence developing
Have you/any of the SPs listed below moved since the time when you were last interviewed in your household?
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Have you/any of the SPs listed below moved since the time when you were last interviewed in your household? — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Have you/any of the SPs listed below moved since the time when you were last interviewed in your household? — Allergens - Household Dust (Laboratory)
AAXBDMATEvidence developing
Impermeable Mattress Cover
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Impermeable Mattress Cover — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Impermeable Mattress Cover — Allergens - Household Dust (Laboratory)
AAXBDPLWEvidence developing
Impermeable Pillow Cover
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Impermeable Pillow Cover — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Impermeable Pillow Cover — Allergens - Household Dust (Laboratory)
AAXBDSTEvidence developing
Bed Sample Status
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Bed Sample Status — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Bed Sample Status — Allergens - Household Dust (Laboratory)
AAXBDSUREvidence developing
Bed Surface Vacuumed
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Bed Surface Vacuumed — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Bed Surface Vacuumed — Allergens - Household Dust (Laboratory)
AAXFLSTEvidence developing
Floor Sample Status
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Floor Sample Status — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Floor Sample Status — Allergens - Household Dust (Laboratory)
AAXFLTYPEvidence developing
Type of Floor Covering
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Type of Floor Covering — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Type of Floor Covering — Allergens - Household Dust (Laboratory)
AAXRMDESEvidence developing
Room Description
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Room Description — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Room Description — Allergens - Household Dust (Laboratory)
AAXRMHUMEvidence developing
Room Humidity (%)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Room Humidity (%) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Room Humidity (%) — Allergens - Household Dust (Laboratory)
AAXRMTMPEvidence developing
Room Temperature (F)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Room Temperature (F) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Room Temperature (F) — Allergens - Household Dust (Laboratory)
DCD030Compatible with harmonization
Room where samples taken
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Room where samples taken — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Room where samples taken — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Room where samples taken — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Room where samples taken — Lead - Dust (Laboratory)
DCD070ACompatible with harmonization
Indicates whether floor was carpeted in room-floor sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Indicates whether floor was carpeted in room-floor sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Indicates whether floor was carpeted in room-floor sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Indicates whether floor was carpeted in room-floor sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Indicates whether floor was carpeted in room-floor sample — Lead - Dust (Laboratory)
DCDINDEXCompatible with harmonization
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — — Lead - Dust (Laboratory)
- 2001-2002: L20_B — — Lead - Dust (Laboratory)
- 2003-2004: L20_C — — Lead - Dust (Laboratory)
DCDSTATCompatible with harmonization
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — — Lead - Dust (Laboratory)
- 2001-2002: L20_B — — Lead - Dust (Laboratory)
- 2003-2004: L20_C — — Lead - Dust (Laboratory)
DCQ070BCompatible with harmonization
Indicates whether mat was found in room-floor sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Indicates whether mat was found in room-floor sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Indicates whether mat was found in room-floor sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Indicates whether mat was found in room-floor sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Indicates whether mat was found in room-floor sample — Lead - Dust (Laboratory)
DCQ070CCompatible with harmonization
Indicates whether area rug was found in room-floor sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Indicates whether area rug was found in room-floor sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Indicates whether area rug was found in room-floor sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Indicates whether area rug was found in room-floor sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Indicates whether area rug was found in room-floor sample — Lead - Dust (Laboratory)
DCQ070DCompatible with harmonization
If there was wall to wall carpet-floor sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- If there was wall to wall carpet-floor sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — If there was wall to wall carpet-floor sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — If there was wall to wall carpet-floor sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — If there was wall to wall carpet-floor sample — Lead - Dust (Laboratory)
DCQ090Compatible with harmonization
Depth of carpeting-floor sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Depth of carpeting-floor sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Depth of carpeting-floor sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Depth of carpeting-floor sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Depth of carpeting-floor sample — Lead - Dust (Laboratory)
DCQ160Compatible with harmonization
Surface condition for floor dust sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Surface condition for floor dust sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Surface condition for floor dust sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Surface condition for floor dust sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Surface condition for floor dust sample — Lead - Dust (Laboratory)
DCQ240Compatible with harmonization
Window sill finished
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Window sill finished — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Window sill finished — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Window sill finished — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Window sill finished — Lead - Dust (Laboratory)
DCQ250Compatible with harmonization
Surface condition for sill dust sample
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Surface condition for sill dust sample — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — Surface condition for sill dust sample — Lead - Dust (Laboratory)
- 2001-2002: L20_B — Surface condition for sill dust sample — Lead - Dust (Laboratory)
- 2003-2004: L20_C — Surface condition for sill dust sample — Lead - Dust (Laboratory)
DCQ400Compatible with harmonization
INTERVIEWER OBSERVATION: ROOM CLEANLINESS
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- INTERVIEWER OBSERVATION: ROOM CLEANLINESS — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — INTERVIEWER OBSERVATION: ROOM CLEANLINESS — Lead - Dust (Laboratory)
- 2001-2002: L20_B — INTERVIEWER OBSERVATION: ROOM CLEANLINESS — Lead - Dust (Laboratory)
- 2003-2004: L20_C — INTERVIEWER OBSERVATION: ROOM CLEANLINESS — Lead - Dust (Laboratory)
DCQ410Compatible with harmonization
INTERVIEWER OBSERVATION: ROOM CLUTTER
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- INTERVIEWER OBSERVATION: ROOM CLUTTER — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: LAB20 — INTERVIEWER OBSERVATION: ROOM CLUTTER — Lead - Dust (Laboratory)
- 2001-2002: L20_B — INTERVIEWER OBSERVATION: ROOM CLUTTER — Lead - Dust (Laboratory)
- 2003-2004: L20_C — INTERVIEWER OBSERVATION: ROOM CLUTTER — Lead - Dust (Laboratory)
DSDAA1LCEvidence developing
Fungus Alternaria alternata 1 (Alt a 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Alternaria alternata 1 (Alt a 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Alternaria alternata 1 (Alt a 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDAF1LCEvidence developing
Fungus Aspergillus fumigatus dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Aspergillus fumigatus dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Aspergillus fumigatus dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDBG1LCEvidence developing
German cockroach Blattella germanica 1 (Bla g 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 1 (Bla g 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 1 (Bla g 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDBG2LCEvidence developing
German cockroach Blattella germanica 2 (Bla g 2) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 2 (Bla g 2) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 2 (Bla g 2) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDCF1LCEvidence developing
Dog allergen Canis familiaris 1 (Can f 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dog allergen Canis familiaris 1 (Can f 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dog allergen Canis familiaris 1 (Can f 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDDF1LCEvidence developing
Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDDP1LCEvidence developing
Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDENXLCEvidence developing
Endotoxin dust, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Endotoxin dust, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Endotoxin dust, comment code — Allergens - Household Dust (Laboratory)
DSDFD1LCEvidence developing
Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, comment code — Allergens - Household Dust (Laboratory)
DSDMM1LCEvidence developing
Mouse urinary protein (Mus m 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Mouse urinary protein (Mus m 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Mouse urinary protein (Mus m 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSDRN1LCEvidence developing
Rat urinary protein (Rat n 1) dust antigen, comment code
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Rat urinary protein (Rat n 1) dust antigen, comment code — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Rat urinary protein (Rat n 1) dust antigen, comment code — Allergens - Household Dust (Laboratory)
DSXAA1Evidence developing
Fungus Alternaria alternata 1 (Alt a 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Alternaria alternata 1 (Alt a 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Alternaria alternata 1 (Alt a 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXAA1LDEvidence developing
Fungus Alternaria alternata 1 (Alt a 1) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Alternaria alternata 1 (Alt a 1) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Alternaria alternata 1 (Alt a 1) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXAF1Evidence developing
Fungus Aspergillus fumigatus dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Aspergillus fumigatus dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Aspergillus fumigatus dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXAF1LDEvidence developing
Fungus Aspergillus fumigatus dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Fungus Aspergillus fumigatus dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Fungus Aspergillus fumigatus dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXBG1Evidence developing
German cockroach Blattella germanica 1 (Bla g 1) dust antigen, result (U/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 1 (Bla g 1) dust antigen, result (U/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 1 (Bla g 1) dust antigen, result (U/mL dust) — Allergens - Household Dust (Laboratory)
DSXBG1LDEvidence developing
German cockroach Blattella germanica 1 (Bla g 1) dust antigen, limit of detection (U/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 1 (Bla g 1) dust antigen, limit of detection (U/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 1 (Bla g 1) dust antigen, limit of detection (U/mL dust) — Allergens - Household Dust (Laboratory)
DSXBG2Evidence developing
German cockroach Blattella germanica 2 (Bla g 2) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 2 (Bla g 2) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 2 (Bla g 2) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXBG2LDEvidence developing
German cockroach Blattella germanica 2 (Bla g 2) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- German cockroach Blattella germanica 2 (Bla g 2) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — German cockroach Blattella germanica 2 (Bla g 2) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXCF1Evidence developing
Dog allergen Canis familiaris 1 (Can f 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dog allergen Canis familiaris 1 (Can f 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dog allergen Canis familiaris 1 (Can f 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXCF1LDEvidence developing
Dog allergen Canis familiaris 1 (Can f 1) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dog allergen Canis familiaris 1 (Can f 1) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dog allergen Canis familiaris 1 (Can f 1) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXDF1Evidence developing
Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides farinae 1 (Der f 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXDF1LDEvidence developing
Dust mite Dermatophagoides farinae 1 (Der f 1) dust allergen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides farinae 1 (Der f 1) dust allergen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides farinae 1 (Der f 1) dust allergen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXDP1Evidence developing
Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXDP1LDEvidence developing
Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXENXEvidence developing
Endotoxin dust, result (EU/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Endotoxin dust, result (EU/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Endotoxin dust, result (EU/mL dust) — Allergens - Household Dust (Laboratory)
DSXENXLDEvidence developing
Endotoxin dust, limit of detection (EU/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Endotoxin dust, limit of detection (EU/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Endotoxin dust, limit of detection (EU/mL dust) — Allergens - Household Dust (Laboratory)
DSXFD1Evidence developing
Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXFD1LDEvidence developing
Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Cat allergen Felis domesticus 1 (Fel d 1) dust allergen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXMM1Evidence developing
Mouse urinary protein (Mus m 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Mouse urinary protein (Mus m 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Mouse urinary protein (Mus m 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXMM1LDEvidence developing
Mouse urinary protein (Mus m 1) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Mouse urinary protein (Mus m 1) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Mouse urinary protein (Mus m 1) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXRN1Evidence developing
Rat urinary protein (Rat n 1) dust antigen, result (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Rat urinary protein (Rat n 1) dust antigen, result (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Rat urinary protein (Rat n 1) dust antigen, result (ng/mL dust) — Allergens - Household Dust (Laboratory)
DSXRN1LDEvidence developing
Rat urinary protein (Rat n 1) dust antigen, limit of detection (ng/mL dust)
- Observed years
- 2005–2006
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Rat urinary protein (Rat n 1) dust antigen, limit of detection (ng/mL dust) — 2005-2006
Cycle-by-cycle release history
- 2005-2006: ALDUST_D — Rat urinary protein (Rat n 1) dust antigen, limit of detection (ng/mL dust) — Allergens - Household Dust (Laboratory)
ELISAEvidence developing
ELISA result interpretation
- Observed years
- 2003–2004
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- ELISA result interpretation — 2003-2004
Cycle-by-cycle release history
- 2003-2004: SSQFEV_C — ELISA result interpretation — Coxiella Burnetii (Q Fever) Antibodies - Serum (Surplus) (Laboratory)
ETHNICTYCompatible with harmonization
Ethnicity - Recode
- Observed years
- 2005–2008
- Release records
- 8
- Datasets
- 8
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Ethnicity - Recode — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: BFRPOL_D — Ethnicity - Recode — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
- 2005-2006: DOXPOL_D — Ethnicity - Recode — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
- 2005-2006: PCBPOL_D — Ethnicity - Recode — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2005-2006: PSTPOL_D — Ethnicity - Recode — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
- 2007-2008: BFRPOL_E — Ethnicity - Recode — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
- 2007-2008: DOXPOL_E — Ethnicity - Recode — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — Ethnicity - Recode — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PSTPOL_E — Ethnicity - Recode — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
GTDBL2MNAdjustment required
Time from fasting glucose & OGTT (min)
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Time from fasting glucose & OGTT (min) — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Time from fasting glucose & OGTT (min) — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Time from fasting glucose & OGTT (min) — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Time from fasting glucose & OGTT (min) — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Time from fasting glucose & OGTT (min) — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Time from fasting glucose & OGTT (min) — Oral Glucose Tolerance Test (Laboratory)
GTDCODEAdjustment required
Incomplete OGTT Comment Code
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Incomplete OGTT Comment Code — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Incomplete OGTT Comment Code — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Incomplete OGTT Comment Code — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Incomplete OGTT Comment Code — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Incomplete OGTT Comment Code — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Incomplete OGTT Comment Code — Oral Glucose Tolerance Test (Laboratory)
GTDDR1MNAdjustment required
Time from fast glucose & challenge (min)
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Time from fast glucose & challenge (min) — 2007-2008
- Time from fast glucose & challenge(min) — 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Time from fast glucose & challenge (min) — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Time from fast glucose & challenge(min) — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Time from fast glucose & challenge(min) — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Time from fast glucose & challenge(min) — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Time from fast glucose & challenge(min) — Oral Glucose Tolerance Test (Laboratory)
GTDDR2MNAdjustment required
Time from glucose challenge & OGTT(min)
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Time from glucose challenge & OGTT(min) — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Time from glucose challenge & OGTT(min) — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Time from glucose challenge & OGTT(min) — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Time from glucose challenge & OGTT(min) — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Time from glucose challenge & OGTT(min) — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Time from glucose challenge & OGTT(min) — Oral Glucose Tolerance Test (Laboratory)
GTDSCMMNAdjustment required
Glucose challenge Administer Time in minutes
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Glucose challenge Administer Time in minutes — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
GTXDRANKAdjustment required
Amount of glucose challenge drank
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Amount of glucose challenge drank — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Amount of glucose challenge drank — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Amount of glucose challenge drank — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Amount of glucose challenge drank — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Amount of glucose challenge drank — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Amount of glucose challenge drank — Oral Glucose Tolerance Test (Laboratory)
HRDHGEvidence developing
Total Hair Mercury as ug mercury/gram hair (ppm): MDL is Detection Limit (See Documentation for Definitions)
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Total Hair Mercury as ug mercury/gram hair (ppm): MDL is Detection Limit (See Documentation for Definitions) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB22 — Total Hair Mercury as ug mercury/gram hair (ppm): MDL is Detection Limit (See Documentation for Definitions) — Mercury - Hair (Laboratory)
HRDHGLCEvidence developing
The comment code associated with the value of the HRXHG variable (see Documentation for definitions)
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- The comment code associated with the value of the HRXHG variable (see Documentation for definitions) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB22 — The comment code associated with the value of the HRXHG variable (see Documentation for definitions) — Mercury - Hair (Laboratory)
HRDHGLC2Evidence developing
The comment code associated with the value of the HRDHG variable (see Documentation for definitions)
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- The comment code associated with the value of the HRDHG variable (see Documentation for definitions) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB22 — The comment code associated with the value of the HRDHG variable (see Documentation for definitions) — Mercury - Hair (Laboratory)
HRQ010Evidence developing
Has your hair been given a permanent or been treated with a hair dye or a hair straightener within the last month?
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Has your hair been given a permanent or been treated with a hair dye or a hair straightener within the last month? — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB22 — Has your hair been given a permanent or been treated with a hair dye or a hair straightener within the last month? — Mercury - Hair (Laboratory)
HRXHGEvidence developing
Total Hair Mercury as ug mercury/gram hair (ppm): MQL is Detection Limit (See Documentation for Definitions)
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Total Hair Mercury as ug mercury/gram hair (ppm): MQL is Detection Limit (See Documentation for Definitions) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB22 — Total Hair Mercury as ug mercury/gram hair (ppm): MQL is Detection Limit (See Documentation for Definitions) — Mercury - Hair (Laboratory)
KID221Adjustment required
How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer?
- Observed years
- 2003–2010
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — 2003-2004 · 2005-2006 · 2009-2010
Cycle-by-cycle release history
- 2003-2004: L11PSA_C — How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ110Adjustment required
Are you willing to have your blood tested for PSA?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Are you willing to have your blood tested for PSA? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — Are you willing to have your blood tested for PSA? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — Are you willing to have your blood tested for PSA? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — Are you willing to have your blood tested for PSA? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — Are you willing to have your blood tested for PSA? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — Are you willing to have your blood tested for PSA? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ115Adjustment required
{Do you/does SP} have an infection or inflammation of the prostate gland at the present time?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Do you/does SP} have an infection or inflammation of the prostate gland at the present time? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ185Adjustment required
{Have you/Has SP} had a rectal exam in the last 7 days?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} had a rectal exam in the last 7 days? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} had a rectal exam in the last 7 days? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} had a rectal exam in the last 7 days? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} had a rectal exam in the last 7 days? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} had a rectal exam in the last 7 days? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} had a rectal exam in the last 7 days? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ190Compatible with harmonization
{Have you/Has SP} had a prostate biopsy in the last 4 weeks?
- Observed years
- 2001–2004
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} had a prostate biopsy in the last 4 weeks? — 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} had a prostate biopsy in the last 4 weeks? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} had a prostate biopsy in the last 4 weeks? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ191Adjustment required
{Have you/Has SP} had a prostate biopsy or other prostate surgery in the last 4 weeks?
- Observed years
- 2005–2010
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} had a prostate biopsy or other prostate surgery in the last 4 weeks? — 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2005-2006: PSA_D — {Have you/Has SP} had a prostate biopsy or other prostate surgery in the last 4 weeks? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} had a prostate biopsy or other prostate surgery in the last 4 weeks? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} had a prostate biopsy or other prostate surgery in the last 4 weeks? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ195Adjustment required
{Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.)
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.) — Prostate Specific Antigen (PSA) (Laboratory)
KIQ201Adjustment required
{Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ221Adjustment required
How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer?
- Observed years
- 2001–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — 2001-2002 · 2007-2008
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — Prostate specific antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ241Adjustment required
{Have you/Has SP} ever had surgery on {your/his} prostate?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} ever had surgery on {your/his} prostate? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} ever had surgery on {your/his} prostate? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} ever had surgery on {your/his} prostate? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} ever had surgery on {your/his} prostate? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} ever had surgery on {your/his} prostate? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} ever had surgery on {your/his} prostate? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ281Compatible with harmonization
Was the surgery for cancer of the prostate gland?
- Observed years
- 2001–2004
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was the surgery for cancer of the prostate gland? — 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — Was the surgery for cancer of the prostate gland? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — Was the surgery for cancer of the prostate gland? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ282Adjustment required
{Have you/Has SP} had surgery for prostate cancer?
- Observed years
- 2005–2010
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} had surgery for prostate cancer? — 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2005-2006: PSA_D — {Have you/Has SP} had surgery for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} had surgery for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} had surgery for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ301Adjustment required
{Have you/Has SP} ever had radiation treatments for prostate cancer?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} ever had radiation treatments for prostate cancer? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} ever had radiation treatments for prostate cancer? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} ever had radiation treatments for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} ever had radiation treatments for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} ever had radiation treatments for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} ever had radiation treatments for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
KIQ311Adjustment required
{Have you/Has SP} ever taken prescribed medicines for prostate cancer?
- Observed years
- 2001–2010
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2001-2002: L11PSA_B — {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — Prostate specific antigen (PSA) (Laboratory)
- 2003-2004: L11PSA_C — {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2005-2006: PSA_D — {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2007-2008: PSA_E — {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
- 2009-2010: PSA_F — {Have you/Has SP} ever taken prescribed medicines for prostate cancer? — Prostate Specific Antigen (PSA) (Laboratory)
LB2ALCEvidence developing
alpha-carotene(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- alpha-carotene(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — alpha-carotene(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2ALCSIEvidence developing
alpha-carotene(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- alpha-carotene(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — alpha-carotene(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2B12Compatible with harmonization
Vitamin B12, serum (pg/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin B12, serum (pg/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin B12, serum (pg/mL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Vitamin B12, serum (pg/mL) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2B12SICompatible with harmonization
Vitamin B12, serum (pmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin B12, serum (pmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin B12, serum (pmol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Vitamin B12, serum (pmol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2BANOCompatible with harmonization
Basophils number (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Basophils number (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Basophils number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Basophils number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2BAPCompatible with harmonization
Bone alkaline phosphotase (ug/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Bone alkaline phosphotase (ug/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L11_2_R — Bone alkaline phosphotase (ug/L) — C-Reactive Protein & Others, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L11_2_b — Bone alkaline phosphotase (ug/L) — C-Reactive Protein & Others, Second Exam (Laboratory)
LB2BAPCTCompatible with harmonization
Basophils percent (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Basophils percent (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Basophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Basophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2BCDCompatible with harmonization
Cadmium (ug/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Cadmium (ug/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Cadmium (ug/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Cadmium (ug/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2BCDSICompatible with harmonization
Cadmium (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Cadmium (umol/L) — 1999-2000
- Cadmium (nmol/L) — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Cadmium (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Cadmium (nmol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2BECEvidence developing
trans-beta-carotene(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- trans-beta-carotene(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — trans-beta-carotene(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2BECSIEvidence developing
trans-beta-carotene(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- trans-beta-carotene(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — trans-beta-carotene(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2BPBCompatible with harmonization
Lead (ug/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Lead (ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Lead (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Lead (ug/dL) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2BPBSICompatible with harmonization
Lead (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Lead (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Lead (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Lead (umol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2CBCEvidence developing
cis-beta-carotene(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- cis-beta-carotene(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — cis-beta-carotene(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2CBCSIEvidence developing
cis-beta-carotene(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- cis-beta-carotene(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — cis-beta-carotene(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2COTCompatible with harmonization
Cotinine (ng/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Cotinine (ng/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Cotinine (ng/mL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Cotinine (ng/mL) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2COTLCEvidence developing
Cotinine comment code
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Cotinine comment code — 2001-2002
Cycle-by-cycle release history
- 2001-2002: L06_2_B — Cotinine comment code — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2COTSIEvidence developing
Cotinine (nmol/L)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Cotinine (nmol/L) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Cotinine (nmol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2CPCompatible with harmonization
C-peptide: pmol/mL
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- C-peptide: pmol/mL — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — C-peptide: pmol/mL — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — C-peptide: pmol/mL — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2CPSICompatible with harmonization
C-peptide SI(nmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- C-peptide SI(nmol/L) — 1999-2000
- C-peptide (nmol/L) in SI units — 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — C-peptide SI(nmol/L) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — C-peptide (nmol/L) in SI units — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2CRPCompatible with harmonization
C-reactive protein(mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- C-reactive protein(mg/dL) — 1999-2000
- C-reactive protein (mg/dL) — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L11_2_R — C-reactive protein(mg/dL) — C-Reactive Protein & Others, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L11_2_b — C-reactive protein (mg/dL) — C-Reactive Protein & Others, Second Exam (Laboratory)
LB2CRYEvidence developing
beta-cryptoxanthin(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- beta-cryptoxanthin(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — beta-cryptoxanthin(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2CRYSIEvidence developing
beta-cryptoxanthin(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- beta-cryptoxanthin(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — beta-cryptoxanthin(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2DAYAdjustment required
Days between 1st and 2nd exam
- Observed years
- 2000–2002
- Release records
- 23
- Datasets
- 23
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Days between 1st and 2nd exam — 1999-2000 · 2001-2002
- The number of days between the first and second collections — 1999-2000
- Days between first and second exams — 1999-2000 · 2001-2002
- Days between the 1st and 2nd exams — 1999-2000 · 2001-2002
- The number of days between the collection of the first and second exam — 1999-2000 · 2001-2002
- Days between first and second exam — 1999-2000 · 2001-2002
- — 2001-2002
- number of days between the collection of the first and second exam — 2001-2002
- The number of days between the collections of first and second exams — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — The number of days between the first and second collections — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: l10_2_00 — Days between the 1st and 2nd exams — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: L11_2_R — Days between 1st and 2nd exam — C-Reactive Protein & Others, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: l13_2_r — Days between 1st and 2nd exam — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: L16_2_R — The number of days between the collection of the first and second exam — Creatinine & Albumin - Urine, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: l18_2_00 — The number of days between the collection of the first and second exam — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: L19_2_R — The number of days between the collection of the first and second exam — Measles, Rubella, & Varicella, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: l25_2_r — Days between first and second exam — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VID_2_00 — Days between first and second exams — Vitamin D, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — The number of days between the collection of the first and second exam — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: HP2_01_R — Days between the 1st and 2nd exams — Helicobacter pylori (HP1), Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — The number of days between the collections of first and second exams — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
- 2001-2002: L10_2_B — Days between the 1st and 2nd exams — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
- 2001-2002: L11_2_b — number of days between the collection of the first and second exam — C-Reactive Protein & Others, Second Exam (Laboratory)
- 2001-2002: l11p_2_b — — Prostate-specific Antigen (PSA), Second Exam (Laboratory)
- 2001-2002: l13_2_b — The number of days between the collection of the first and second exam — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
- 2001-2002: L16_2_B — The number of days between the collection of the first and second exam — Creatinine & Albumin - Urine, Second Exam (Laboratory)
- 2001-2002: L19_2_B — The number of days between the collection of the first and second exam — Measles, Rubella, & Varicella, Second Exam (Laboratory)
- 2001-2002: l25_2_b — Days between first and second exam — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
- 2001-2002: l39_2_b — Days between 1st and 2nd exam — Erythrocyte Protoporphyrin (Laboratory)
- 2001-2002: L40_2_B — The number of days between the collection of the first and second exam — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
- 2001-2002: VID_2_B — Days between first and second exams — Vitamin D, Second Exam (Laboratory)
- 2001-2002: VIT_2_B — The number of days between the collection of the first and second exam — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2EONOCompatible with harmonization
Eosinophils number (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Eosinophils number (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Eosinophils number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Eosinophils number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2EOPCTCompatible with harmonization
Eosinophils percent (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Eosinophils percent (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Eosinophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Eosinophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2EPPCompatible with harmonization
Erythrocyte protoporphyrin (ug/dL RBC)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Erythrocyte protoporphyrin (ug/dL RBC) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Erythrocyte protoporphyrin (ug/dL RBC) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l39_2_b — Erythrocyte protoporphyrin (ug/dL RBC) — Erythrocyte Protoporphyrin (Laboratory)
LB2EPPSICompatible with harmonization
Erythrocyte protoporphyrin (umol/L RBC)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Erythrocyte protoporphyrin (umol/L RBC) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Erythrocyte protoporphyrin (umol/L RBC) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l39_2_b — Erythrocyte protoporphyrin (umol/L RBC) — Erythrocyte Protoporphyrin (Laboratory)
LB2FBCompatible with harmonization
Fibrinogen (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Fibrinogen (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L11_2_R — Fibrinogen (mg/dL) — C-Reactive Protein & Others, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L11_2_b — Fibrinogen (mg/dL) — C-Reactive Protein & Others, Second Exam (Laboratory)
LB2FBSICompatible with harmonization
Fibrinogen (g/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Fibrinogen (g/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L11_2_R — Fibrinogen (g/L) — C-Reactive Protein & Others, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L11_2_b — Fibrinogen (g/L) — C-Reactive Protein & Others, Second Exam (Laboratory)
LB2FERCompatible with harmonization
Ferritin (ng/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Ferritin (ng/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Ferritin (ng/mL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Ferritin (ng/mL) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2FERSICompatible with harmonization
Ferritin (ug/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Ferritin (ug/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Ferritin (ug/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Ferritin (ug/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2FOLCompatible with harmonization
Folate, serum (ng/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Folate, serum (ng/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Folate, serum (ng/mL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Folate, serum (ng/mL) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2FOLSICompatible with harmonization
Folate, serum (nmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Folate, serum (nmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Folate, serum (nmol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Folate, serum (nmol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2FSHAdjustment required
Follicle stimulating hormone (mIU/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Follicle stimulating hormone (mIU/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Follicle stimulating hormone (mIU/mL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Follicle stimulating hormone (mIU/mL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2FSHSIAdjustment required
Follicle stimulating hormone (IU/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Follicle stimulating hormone (IU/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Follicle stimulating hormone (IU/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Follicle stimulating hormone (IU/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2GHCompatible with harmonization
Glycohemoglobin (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Glycohemoglobin (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — Glycohemoglobin (%) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — Glycohemoglobin (%) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2GLUCompatible with harmonization
Plasma glucose (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Plasma glucose (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — Plasma glucose (mg/dL) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — Plasma glucose (mg/dL) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2GLUSICompatible with harmonization
Plasma glucose: SI(mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Plasma glucose: SI(mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — Plasma glucose: SI(mmol/L) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — Plasma glucose: SI(mmol/L) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2GTCCompatible with harmonization
Gamma tocopherol (ug/dL)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Gamma tocopherol (ug/dL) — 1999-2000
- gamma-tocopherol(ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Gamma tocopherol (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — gamma-tocopherol(ug/dL) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — gamma-tocopherol(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2GTCSICompatible with harmonization
Gamma tocopherol (umol/L)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Gamma tocopherol (umol/L) — 1999-2000
- gamma-tocopherol(umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Gamma tocopherol (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — gamma-tocopherol(umol/L) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — gamma-tocopherol(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2HCTCompatible with harmonization
Hematocrit (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Hematocrit (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Hematocrit (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Hematocrit (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2HCYCompatible with harmonization
Homocysteine (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Homocysteine (umol/L) — 1999-2000
- Homocysteine(umol/L) — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Homocysteine (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Homocysteine(umol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2HDLAdjustment required
HDL-cholesterol (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HDL-cholesterol (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — HDL-cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — HDL-cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2HDLSIAdjustment required
HDL-cholesterol (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HDL-cholesterol (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — HDL-cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — HDL-cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2HGBCompatible with harmonization
Hemoglobin (g/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Hemoglobin (g/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Hemoglobin (g/dL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Hemoglobin (g/dL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2HP1Evidence developing
Helicobacter pylori (HP1)
- Observed years
- 2001–2001
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Helicobacter pylori (HP1) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: HP2_01_R — Helicobacter pylori (HP1) — Helicobacter pylori (HP1), Second Exam (Laboratory) — Note: RDC Only
LB2INCompatible with harmonization
Insulin (uU/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Insulin (uU/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — Insulin (uU/mL) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — Insulin (uU/mL) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2INSICompatible with harmonization
Insulin: SI(pmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Insulin: SI(pmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l10_2_00 — Insulin: SI(pmol/L) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L10_2_B — Insulin: SI(pmol/L) — Glycohemoglobin, Plasma Glucose, Serum C-peptide, & Insulin, Second Exam (Laboratory)
LB2IRNEvidence developing
Iron (ug/dL)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Iron (ug/dL) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Iron (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2IRNSIEvidence developing
Iron (umol/L)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Iron (umol/L) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Iron (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2LDLAdjustment required
LDL-cholesterol (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- LDL-cholesterol (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — LDL-cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — LDL-cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2LDLSIAdjustment required
LDL-cholesterol (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- LDL-cholesterol (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — LDL-cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — LDL-cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2LHAdjustment required
Luteinizing hormone (mIU/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Luteinizing hormone (mIU/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Luteinizing hormone (mIU/mL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Luteinizing hormone (mIU/mL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2LHSIAdjustment required
Luteinizing hormone (IU/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Luteinizing hormone (IU/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Luteinizing hormone (IU/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Luteinizing hormone (IU/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2LUZEvidence developing
Combined Lutein/zeaxanthin(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Combined Lutein/zeaxanthin(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — Combined Lutein/zeaxanthin(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2LUZSIEvidence developing
Combined Lutein/zeaxanthin(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Combined Lutein/zeaxanthin(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — Combined Lutein/zeaxanthin(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2LYCEvidence developing
trans-lycopene(ug/dL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- trans-lycopene(ug/dL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — trans-lycopene(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2LYCSIEvidence developing
trans-lycopene(umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- trans-lycopene(umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: VIT_2_B — trans-lycopene(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2LYMNOCompatible with harmonization
Lymphocyte number (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Lymphocyte number (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Lymphocyte number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Lymphocyte number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2LYPCTCompatible with harmonization
Lymphocyte percent (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Lymphocyte percent (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Lymphocyte percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Lymphocyte percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MCCompatible with harmonization
MCHC (g/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- MCHC (g/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — MCHC (g/dL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — MCHC (g/dL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MCHSICompatible with harmonization
Mean cell hemoglobin (pg)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Mean cell hemoglobin (pg) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Mean cell hemoglobin (pg) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Mean cell hemoglobin (pg) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MCVSICompatible with harmonization
Mean cell volume (fL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Mean cell volume (fL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Mean cell volume (fL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Mean cell volume (fL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MECompatible with harmonization
Measles
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Measles — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L19_2_R — Measles — Measles, Rubella, & Varicella, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L19_2_B — Measles — Measles, Rubella, & Varicella, Second Exam (Laboratory)
LB2MMACompatible with harmonization
Methylmalonic acid (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Methylmalonic acid (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Methylmalonic acid (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Methylmalonic acid (umol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2MONOCompatible with harmonization
Monocyte number (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Monocyte number (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Monocyte number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Monocyte number (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MOPCTCompatible with harmonization
Monocyte percent (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Monocyte percent (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Monocyte percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Monocyte percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2MPSICompatible with harmonization
Mean platelet volume (fL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Mean platelet volume (fL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Mean platelet volume (fL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Mean platelet volume (fL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2NENOCompatible with harmonization
Segmented neutrophils num (1000 cell/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Segmented neutrophils num (1000 cell/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Segmented neutrophils num (1000 cell/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Segmented neutrophils num (1000 cell/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2NEPCTCompatible with harmonization
Segmented neutrophils percent (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Segmented neutrophils percent (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Segmented neutrophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Segmented neutrophils percent (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2P1Evidence developing
Prostate specific antigen, total (ng/mL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Prostate specific antigen, total (ng/mL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: l11p_2_b — Prostate specific antigen, total (ng/mL) — Prostate-specific Antigen (PSA), Second Exam (Laboratory)
LB2P2Evidence developing
Prostate specific antigen (PSA), free (ng/mL)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Prostate specific antigen (PSA), free (ng/mL) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: l11p_2_b — Prostate specific antigen (PSA), free (ng/mL) — Prostate-specific Antigen (PSA), Second Exam (Laboratory)
LB2P3Evidence developing
Prostate specific antigen ratio (%)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Prostate specific antigen ratio (%) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: l11p_2_b — Prostate specific antigen ratio (%) — Prostate-specific Antigen (PSA), Second Exam (Laboratory)
LB2PCTEvidence developing
Transferrin saturation (%)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Transferrin saturation (%) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Transferrin saturation (%) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2PLTSICompatible with harmonization
Platelet count (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Platelet count (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Platelet count (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Platelet count (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2RBCSICompatible with harmonization
Red blood cell count (million cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Red blood cell count (million cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Red blood cell count (million cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Red blood cell count (million cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2RBFCompatible with harmonization
Folate (ng/mL RBC)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Folate (ng/mL RBC) — 1999-2000
- Folate, RBC (ng/mL RBC) — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Folate (ng/mL RBC) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Folate, RBC (ng/mL RBC) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2RBFSICompatible with harmonization
Folate (nmol/L RBC)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Folate (nmol/L RBC) — 1999-2000
- Folate, RBC (nmol/L RBC) — 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Folate (nmol/L RBC) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L06_2_B — Folate, RBC (nmol/L RBC) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2RDWCompatible with harmonization
Red cell distribution width (%)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Red cell distribution width (%) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — Red cell distribution width (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — Red cell distribution width (%) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LB2RPLCompatible with harmonization
Retinyl palmitate (ug/dL)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Retinyl palmitate (ug/dL) — 1999-2000
- Retinyl palmitate(ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Retinyl palmitate (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinyl palmitate(ug/dL) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinyl palmitate(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2RPLSICompatible with harmonization
Retinyl palmitate (umol/L)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Retinyl palmitate (umol/L) — 1999-2000
- Retinyl palmitate(umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Retinyl palmitate (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinyl palmitate(umol/L) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinyl palmitate(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2RSTCompatible with harmonization
Retinyl stearate (ug/dL)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Retinyl stearate (ug/dL) — 1999-2000
- Retinyl stearate(ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Retinyl stearate (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinyl stearate(ug/dL) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinyl stearate(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2RSTSICompatible with harmonization
Retinyl stearate (umol/L)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Retinyl stearate (umol/L) — 1999-2000
- Retinyl stearate(umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Retinyl stearate (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinyl stearate(umol/L) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinyl stearate(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2RUCompatible with harmonization
Rubella
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Rubella — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L19_2_R — Rubella — Measles, Rubella, & Varicella, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L19_2_B — Rubella — Measles, Rubella, & Varicella, Second Exam (Laboratory)
LB2RUIUCompatible with harmonization
Rubella antibody (international units)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Rubella antibody (international units) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L19_2_R — Rubella antibody (international units) — Measles, Rubella, & Varicella, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L19_2_B — Rubella antibody (international units) — Measles, Rubella, & Varicella, Second Exam (Laboratory)
LB2SALAdjustment required
Albumin (g/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Albumin (g/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Albumin (g/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Albumin (g/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SALSIAdjustment required
Albumin (g/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Albumin (g/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Albumin (g/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Albumin (g/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SAPSIAdjustment required
Alkaline phosphotase (U/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Alkaline phosphotase (U/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Alkaline phosphotase (U/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Alkaline phosphotase (U/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SASSIAdjustment required
Aspartate aminotransferase (U/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Aspartate aminotransferase (U/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Aspartate aminotransferase (U/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Aspartate aminotransferase (U/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SATSIAdjustment required
Alanine aminotransferase (U/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Alanine aminotransferase (U/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Alanine aminotransferase (U/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Alanine aminotransferase (U/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SBUAdjustment required
Blood urea nitrogen (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Blood urea nitrogen (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Blood urea nitrogen (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Blood urea nitrogen (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SBUSIAdjustment required
Blood urea nitrogen (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Blood urea nitrogen (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Blood urea nitrogen (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Blood urea nitrogen (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SC3SIAdjustment required
Bicarbonate (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Bicarbonate (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Bicarbonate (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Bicarbonate (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCAAdjustment required
Total calcium (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total calcium (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Total calcium (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Total calcium (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCASIAdjustment required
Total calcium (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total calcium (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Total calcium (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Total calcium (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCHAdjustment required
Cholesterol (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Cholesterol (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Cholesterol (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Cholesterol (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCHSIAdjustment required
Cholesterol (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Cholesterol (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Cholesterol (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Cholesterol (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCLSIAdjustment required
Chloride (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Chloride (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Chloride (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Chloride (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCRAdjustment required
Creatinine (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Creatinine (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Creatinine (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Creatinine (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SCRSIAdjustment required
Creatinine (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Creatinine (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Creatinine (umol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Creatinine (umol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SGLAdjustment required
Glucose (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Glucose (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Glucose (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Glucose (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SGLSIAdjustment required
Glucose, serum (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Glucose, serum (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Glucose, serum (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Glucose, serum (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SGTSIAdjustment required
Gamma glutamyltransferase
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Gamma glutamyltransferase — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Gamma glutamyltransferase — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Gamma glutamyltransferase — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SIRAdjustment required
Iron (ug/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Iron (ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Iron (ug/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Iron (ug/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SIRSIAdjustment required
Iron (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Iron (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Iron (umol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Iron (umol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SKSIAdjustment required
Potassium (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Potassium (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Potassium (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Potassium (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SLDSIAdjustment required
Lactate dehydrogenase (U/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Lactate dehydrogenase (U/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Lactate dehydrogenase (U/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Lactate dehydrogenase (U/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SNASIAdjustment required
Sodium (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Sodium (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Sodium (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Sodium (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SPHAdjustment required
Phosphorus (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Phosphorus (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Phosphorus (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Phosphorus (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SPHSIAdjustment required
Phosphorus (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Phosphorus (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Phosphorus (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Phosphorus (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STBAdjustment required
Bilirubin, total (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Bilirubin, total (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Bilirubin, total (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Bilirubin, total (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STBSIAdjustment required
Bilirubin, total (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Bilirubin, total (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Bilirubin, total (umol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Bilirubin, total (umol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STPAdjustment required
Protein, total (g/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Protein, total (g/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Protein, total (g/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Protein, total (g/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STPSIAdjustment required
Total protein (g/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total protein (g/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Total protein (g/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Total protein (g/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STRAdjustment required
Triglycerides (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Triglycerides (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Triglycerides (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Triglycerides (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2STRSIAdjustment required
Triglycerides (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Triglycerides (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Triglycerides (mmol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Triglycerides (mmol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SUAAdjustment required
Uric acid (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Uric acid (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Uric acid (mg/dL) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Uric acid (mg/dL) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2SUASIAdjustment required
Uric acid (umol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Uric acid (umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l18_2_00 — Uric acid (umol/L) — Standard Biochemistry Profile & Hormones, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L40_2_B — Uric acid (umol/L) — Standard Biochemistry Profile, Follicle Stimulating Hormone & Luteinizing Hormone, Second Exam (Laboratory)
LB2TCAdjustment required
Total cholesterol (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total cholesterol (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — Total cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — Total cholesterol (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2TCSIAdjustment required
Total cholesterol (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total cholesterol (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — Total cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — Total cholesterol (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2THGEvidence developing
Mercury, total (ug/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Mercury, total (ug/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: L06_2_B — Mercury, total (ug/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2THGSIEvidence developing
Mercury, total (umol/L)
- Observed years
- 2001–2002
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Mercury, total (umol/L) — 2001-2002
Cycle-by-cycle release history
- 2001-2002: L06_2_B — Mercury, total (umol/L) — Cadmium, Lead, Total Mercury, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine - Blood, Second Exam (Laboratory)
LB2TIBEvidence developing
TIBC (ug/dL)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- TIBC (ug/dL) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — TIBC (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2TIBSIEvidence developing
TIBC (umol/L)
- Observed years
- 2000–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- TIBC (umol/L) — 1999-2000
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — TIBC (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
LB2TRAdjustment required
Triglyceride (mg/dL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Triglyceride (mg/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — Triglyceride (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — Triglyceride (mg/dL) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2TRSIAdjustment required
Triglyceride (mmol/L)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Triglyceride (mmol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l13_2_r — Triglyceride (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l13_2_b — Triglyceride (mmol/L) — Cholesterol - Total, HDL, LDL & Triglycerides, Second Exam (Laboratory)
LB2VARCompatible with harmonization
Varicella
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Varicella — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L19_2_R — Varicella — Measles, Rubella, & Varicella, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: L19_2_B — Varicella — Measles, Rubella, & Varicella, Second Exam (Laboratory)
LB2VIACompatible with harmonization
Vitamin A (ug/dL)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin A (ug/dL) — 1999-2000
- Retinol(ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin A (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinol(ug/dL) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinol(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2VIASICompatible with harmonization
Vitamin A (umol/L)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin A (umol/L) — 1999-2000
- Retinol(umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin A (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — Retinol(umol/L) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — Retinol(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2VIDCompatible with harmonization
Vitamin D (ng/mL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin D (ng/mL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: VID_2_00 — Vitamin D (ng/mL) — Vitamin D, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VID_2_B — Vitamin D (ng/mL) — Vitamin D, Second Exam (Laboratory)
LB2VIECompatible with harmonization
Vitamin E (ug/dL)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin E (ug/dL) — 1999-2000
- alpha-tocopherol(ug/dL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin E (ug/dL) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — alpha-tocopherol(ug/dL) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — alpha-tocopherol(ug/dL) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2VIESICompatible with harmonization
Vitamin E (umol/L)
- Observed years
- 2000–2002
- Release records
- 3
- Datasets
- 3
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin E (umol/L) — 1999-2000
- alpha-tocopherol(umol/L) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: L06_2_00 — Vitamin E (umol/L) — Cadmium, Lead, Ferritin, Serum Folate, RBC Folate, Vitamin B12, Homocysteine, Methylmalonic acid, Cotinine & Other Selected Nutritional Biochemistries - Blood, Second Exam (Laboratory) — Note: RDC Only
- 1999-2000: VIT_2_R — alpha-tocopherol(umol/L) — Vitamin A & Vitamin E, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: VIT_2_B — alpha-tocopherol(umol/L) — Vitamin A, Vitamin E, & Carotenoids, Second Exam (Laboratory)
LB2WBCSICompatible with harmonization
White blood cell count (1000 cells/uL)
- Observed years
- 2000–2002
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- White blood cell count (1000 cells/uL) — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: l25_2_r — White blood cell count (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory) — Note: RDC Only
- 2001-2002: l25_2_b — White blood cell count (1000 cells/uL) — Complete Blood Count with 5-part Differential - Whole Blood, Second Exam (Laboratory)
LBAMMT1Compatible with harmonization
Molecular Type 1
- Observed years
- 2001–2004
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Molecular Type 1 — 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 2001-2002: L35_B — Molecular Type 1 — Methicillin - Resistant Staphylococcus aureus (MRSA) (Laboratory)
- 2003-2004: L35_C — Molecular Type 1 — Methicillin - Resistant Staphylococcus aureus (MRSA) (Laboratory)
LBAMMT2Compatible with harmonization
Molecular type 2
- Observed years
- 2001–2004
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Molecular type 2 — 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 2001-2002: L35_B — Molecular type 2 — Methicillin - Resistant Staphylococcus aureus (MRSA) (Laboratory)
- 2003-2004: L35_C — Molecular type 2 — Methicillin - Resistant Staphylococcus aureus (MRSA) (Laboratory)
LBAVOCSDEvidence developing
The time (in minutes) between start time of wearing the badge and stop time of wearing the badge.
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Laboratory
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- The time (in minutes) between start time of wearing the badge and stop time of wearing the badge. — 1999-2000
Cycle-by-cycle release history
- 1999-2000: LAB21 — The time (in minutes) between start time of wearing the badge and stop time of wearing the badge. — Volatile Organic Compounds (VOC) - Personal Exposure Badge (Laboratory)
LBC028Compatible with harmonization
PCB 28 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 28 (ng/g) — 2005-2006 · 2007-2008
- 2,4,4’-Trichlorobiphenyl (pg/g) — 2009-2010
- 2,4,4'-Trichlorobiphenyl (pg/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 28 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 28 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,4,4’-Trichlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,4,4'-Trichlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,4,4'-Trichlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,4,4'-Trichlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC028LACompatible with harmonization
PCB 28 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 28 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,4,4’-Trichlorobiphenyl Lipid Adjusted — 2009-2010
- 2,4,4'-Trichlorobiphenyl Lipid Adjusted — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 28 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 28 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,4,4’-Trichlorobiphenyl Lipid Adjusted — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,4,4'-Trichlorobiphenyl Lipid Adjusted — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,4,4'-Trichlorobiphenyl Lipid Adjusted — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,4,4'-Trichlorobiphenyl Lipid Adjusted — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC044Compatible with harmonization
PCB 44 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 44 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 44 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 44 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC044LACompatible with harmonization
PCB 44 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 44 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 44 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 44 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC049Compatible with harmonization
PCB 49 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 49 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 49 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 49 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC049LACompatible with harmonization
PCB 49 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 49 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 49 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 49 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC052Compatible with harmonization
PCB 52 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 52 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 52 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 52 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC052LACompatible with harmonization
PCB 52 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 52 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 52 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 52 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC066Compatible with harmonization
PCB 66 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 66 (ng/g) — 2005-2006 · 2007-2008
- 2,3’,4,4’-Tetrachlorobiphenyl (pg/g) — 2009-2010
- 2,3',4,4'-Tetrachlorobiphenyl (pg/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 66 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 66 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3’,4,4’-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3',4,4'-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3',4,4'-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3',4,4'-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC066LACompatible with harmonization
PCB 66 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 66 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,3’,4,4’-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — 2009-2010
- 2,3',4,4'-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 66 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 66 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3’,4,4’-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3',4,4'-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3',4,4'-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3',4,4'-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC074Compatible with harmonization
PCB 74 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 74 (ng/g) — 2005-2006 · 2007-2008
- 2,4,4’,5-Tetrachlorobiphenyl (pg/g) — 2009-2010
- 2,4,4',5-Tetrachlorobiphenyl (pg/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 74 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 74 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,4,4’,5-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,4,4',5-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,4,4',5-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,4,4',5-Tetrachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC074LACompatible with harmonization
PCB 74 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 74 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,4,4’,5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — 2009-2010
- 2,4,4',5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 74 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 74 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,4,4’,5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,4,4',5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,4,4',5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,4,4',5-Tetrachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC087Compatible with harmonization
PCB 87 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 87 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 87 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 87 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC087LACompatible with harmonization
PCB 87 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 87 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 87 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 87 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC099Compatible with harmonization
PCB 99 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 99 (ng/g) — 2005-2006 · 2007-2008
- 2,2’,4,4’,5-Pentachlorobiphenyl (pg/g) — 2009-2010
- 2,2',4,4',5-Pentachlorobiphenyl (pg/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 99 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 99 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,2’,4,4’,5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,2',4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,2',4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,2',4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC099LACompatible with harmonization
PCB 99 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 99 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,2’,4,4’,5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — 2009-2010
- 2,2',4,4',5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 99 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 99 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,2’,4,4’,5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,2',4,4',5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,2',4,4',5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,2',4,4',5-Pentachlorobiphenyl Lipid Adjusted(ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC101Compatible with harmonization
PCB 101 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 101 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 101 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 101 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC101LACompatible with harmonization
PCB 101 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 101 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 101 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 101 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC105Compatible with harmonization
PCB 105 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 105 (ng/g) — 2005-2006 · 2007-2008
- 2,3,3’,4,4’-Pentachlorobiphenyl (pg/g) — 2009-2010
- 2,3,3',4,4'-Pentachlorobiphenyl (pg/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 105 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 105 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3,3’,4,4’-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3,3',4,4'-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3,3',4,4'-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3,3',4,4'-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC105LACompatible with harmonization
PCB 105 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 105 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,3,3’,4,4’-Pentachlorobiphenyl Lipid Adjusted (ng/g) — 2009-2010
- 2,3,3',4,4'-Pentachlorobiphenyl Lipid Adjusted (ng/g) — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 105 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 105 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3,3’,4,4’-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3,3',4,4'-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3,3',4,4'-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3,3',4,4'-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC110Compatible with harmonization
PCB 110 (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 110 (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 110 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 110 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC110LACompatible with harmonization
PCB 110 Lipid Adj (ng/g)
- Observed years
- 2005–2008
- Release records
- 2
- Datasets
- 2
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 110 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 110 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 110 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC114Compatible with harmonization
PCB 114 (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 114 (ng/g) — 2005-2006 · 2007-2008
- 2,3,4,4',5-Pentachlorobiphenyl (pg/g) — 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 114 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 114 (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3,4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3,4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3,4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3,4,4',5-Pentachlorobiphenyl (pg/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
LBC114LACompatible with harmonization
PCB 114 Lipid Adj (ng/g)
- Observed years
- 2005–2016
- Release records
- 6
- Datasets
- 6
- Components
- Laboratory
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- PCB 114 Lipid Adj (ng/g) — 2005-2006 · 2007-2008
- 2,3,4,4',5-Pentachlorobiphenyl Lipid Adjusted (ng/g) — 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2005-2006: PCBPOL_D — PCB 114 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2007-2008: PCBPOL_E — PCB 114 Lipid Adj (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2009-2010: PCBPOL_F — 2,3,4,4',5-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2011-2012: PCBPOL_G — 2,3,4,4',5-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
- 2013-2014: PCBPOL_H — 2,3,4,4',5-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
- 2015-2016: PCBPOL_I — 2,3,4,4',5-Pentachlorobiphenyl Lipid Adjusted (ng/g) — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)