Antithyroid Antibody Test

Antithyroid antibody tests (anti‑TPO or anti‑thyroglobulin) vary widely in cost. They’re often free via public healthcare but privately typically range about USD $30–200 (roughly INR ₹500–2,500; GBP £25–150). Comprehensive panels or specialty labs can charge more. Final price depends on country, lab, and whether insurance covers testing—check local lab fees or ask your clinician.

Testing positive for thyroid antibodies indicates an autoimmune thyroid process (eg, Hashimoto’s or Graves’) and raises the risk of developing thyroid dysfunction, though you may be currently euthyroid. Your clinician will monitor TSH and free T4 regularly. Treatment is only needed if function or symptoms warrant — levothyroxine for hypothyroidism or antithyroid therapy for hyperthyroidism. Pregnancy needs closer surveillance; follow-up is advised.

Typical reference ranges: anti‑thyroid peroxidase (anti‑TPO) <35 IU/mL, anti‑thyroglobulin (anti‑Tg) <40 IU/mL, and TSH‑receptor antibodies (TRAb/TSI) generally <1.5–1.8 IU/L. Values above lab-specific cutoffs suggest autoimmune thyroid disease (e.g., Hashimoto’s or Graves’). Always interpret results using your lab’s reference ranges and clinical context; discuss abnormal results with your clinician. Pregnancy and different assays can alter cutoffs.

The anti-TPO antibody test is a blood test that detects antibodies against thyroid peroxidase, an enzyme needed for thyroid hormone production. Elevated anti‑TPO levels indicate autoimmune thyroid disease, commonly Hashimoto’s thyroiditis and sometimes Graves’ disease. It helps diagnose and monitor thyroid autoimmunity, clarify abnormal TSH/T4 results, and may be ordered for unexplained thyroid symptoms, pregnancy, or infertility evaluation.

Antithyroid antibodies are markers of autoimmune thyroid disease and generally cannot be cured outright. Treatment targets the thyroid dysfunction (levothyroxine for hypothyroidism; antithyroid drugs, radioiodine, or surgery for hyperthyroidism). Antibody levels may fall with treatment, pregnancy, or immunomodulatory therapy, but antibodies often persist. Management focuses on symptoms and maintaining normal thyroid hormone levels rather than eradicating antibodies.

A doctor orders thyroid antibody tests to check for autoimmune causes of abnormal thyroid function—most commonly Hashimoto’s or Graves’ disease—by detecting antibodies such as anti‑TPO or TRAb. Testing helps confirm diagnosis, explain unexplained hypo‑ or hyperthyroidism, postpartum or infertility‑related thyroid issues, predict progression to overt disease, guide treatment decisions, and assess risk during pregnancy.