What Is a Thyroid Blood Test?
Thyroid blood tests evaluate how well your thyroid gland is functioning.
Common Thyroid Tests
- TSH: most sensitive screening test
- Free T4: main hormone produced by thyroid
- Free T3: active hormone
- Anti-TPO antibodies: Hashimoto's
- TSI: Graves' disease
Typical Panel
- TSH + free T4 for basic screening
- Add free T3 and antibodies for full evaluation
When to Test
- Symptoms of hypo/hyperthyroidism
- Family history
- Pregnancy
- Monitoring medication
Source: NLM MedlinePlus, American Association for Clinical Chemistry.
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