The Anti-Thyroid Peroxidase (Anti-TPO) antibody test detects autoantibodies directed against thyroid peroxidase, an essential enzyme in thyroid hormone synthesis. This test, often including Anti-Thyroglobulin Antibody (ATA) measurement, is a key marker for diagnosing autoimmune thyroid disorders such as Hashimoto’s thyroiditis and Graves’ disease. Elevated antibody levels help assess the extent of thyroid autoimmunity, guide treatment decisions, and monitor disease progression or recurrence after therapy.
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