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endocrinology
Free Thyroxine
Free T4· also: Free T4, fT4
Clinical Overview
Free T4 is the active, unbound form of thyroxine. Low Free T4 with high TSH confirms hypothyroidism; high Free T4 with low TSH confirms hyperthyroidism.
Reference RangesWHO/IFCC standards
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 0.8 – 1.8 | ng/dL | — |
Also reported in: pmol/L.Conversion factor: 1 pmol/L = 12.870 ng/dL.
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Related Topics
thyroidT4TFThypothyroidism