Free T4 (Thyroxine) Test
Blood
Thyroid
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How to Prepare for Free T4 (Thyroxine) Test
- No fasting is required for this test.
- Biotin supplements can interfere with results, so mention any you're taking to your doctor before testing.
- It's typically drawn in the same blood sample as TSH.
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Quick Facts
CategoryThyroid
Specimen TypeBlood
Organ System—
Available At0 labs
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