What Is a Thyroid Function Test?
Thyroid function tests evaluate how well the thyroid works.
Tests
- TSH — most sensitive
- Free T4
- Free T3
- Anti-TPO — Hashimoto's
- TSI — Graves'
Interpreting
- High TSH = hypo
- Low TSH = hyper
- Normal = OK
Source: NLM MedlinePlus, American Association for Clinical Chemistry.
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