Free T4 (Thyroxine) Test
Blood
Thyroid
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Free T4 (Thyroxine) Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Adults | 0.8–1.8 ng/dL |
A low Free T4 with a high TSH confirms primary hypothyroidism, while a high Free T4 with a suppressed TSH confirms hyperthyroidism — values that don't fit this expected pattern may point toward a rarer pituitary-related thyroid problem.
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Quick Facts
CategoryThyroid
Specimen TypeBlood
Organ System—
Available At0 labs
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