Free T4 (Thyroxine) Test
Blood
Thyroid
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When Should You Get Free T4 (Thyroxine) Test
Free T4 is ordered alongside TSH to assess:
- Suspected hypothyroidism or hyperthyroidism
- Monitoring and adjusting thyroid hormone replacement dosage
- Investigating symptoms like fatigue, weight change, or heat/cold intolerance
- Pituitary gland function when TSH results are difficult to interpret
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Quick Facts
CategoryThyroid
Specimen TypeBlood
Organ System—
Available At0 labs
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