What Is a Thyroid Antibody Test?
Thyroid antibody tests detect immune proteins that attack the thyroid gland.
Types
- Anti-TPO: Hashimoto's (90–95% positive)
- TSI: Graves' disease (90% positive)
- Anti-thyroglobulin: Hashimoto's, thyroid cancer monitoring
When Ordered
- Elevated TSH — to identify cause
- Family history
- Other autoimmune conditions
- Recurrent miscarriage
Source: American Thyroid Association, NLM MedlinePlus.
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