Biomarker reference
Free T4
Biomarker Reference Sheet — research tool, not FDA-cleared. Ranges under citation review.
Metadata
Reference Ranges
| Range type | Value |
|---|---|
| Male reference | 0.8–1.8 ng/dL |
| Female reference | 0.8–1.8 ng/dL |
| Optimal | Optimal range not yet defined |
Sex-specific reference ranges from the registry. Generic reference_range column is not used.
Provenance
Source documentation pending — reference ranges are under citation review.
Interpretation
Used in Patterns
Pattern cards in progress for this biomarker category.
Validation Snapshot
NHANES validation pending — no Tier A representative dataset run yet for this biomarker.
HIPAA-aligned design · ZDR active · Anthropic BAA · Pending legal review. Zenlo Labs is a clinical decision support tool intended exclusively for use by licensed healthcare providers — not a substitute for professional medical judgment, and not intended for direct patient use.