Thyroid Profile (T3, T4, TSH) Test
Blood
Thyroid
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How to Prepare for Thyroid Profile (T3, T4, TSH) Test
- Fasting is generally not required, though your doctor may ask for a morning sample for consistency.
- If you're already taking thyroid medication, ask your doctor whether to take your usual dose before or after the blood draw, since timing can slightly affect T3 and T4 readings.
- Mention biotin supplements to your lab, as high-dose biotin can interfere with many thyroid hormone assays and cause misleadingly abnormal results.
- Try to have this test done at a consistent time of day if you're monitoring thyroid levels over multiple visits.
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Quick Facts
CategoryThyroid
Specimen TypeBlood
Organ SystemThyroid & Endocrine Glands
Available At0 labs
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