Frequently asked question: What is Anti-TPO?

Anti-TPO is an antibody against TPO. TPO (thyroid peroxidase) is an enzyme that is produced by the thyroid gland. It assists in the formation of thyroid hormone. Anti-TPO, which is made by your own immune system, targets the thyroid gland. Anti-TPO may be present if you have Hashimoto's thyroiditis (thyroid works too slowly), Graves' disease (thyroid works too quickly), or with a normally functioning thyroid gland. Purpose: to detect an auto-immune thyroid disorder.

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