Thyroid Peroxidase Test

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What is thyroid peroxidase?

Thyroid peroxidase (TPO) is an enzyme made in the thyroid gland that is important in the production of thyroid hormone. TPO is found in thyroid follicle cells where it converts the thyroid hormone T4 to T3.

The thyroid gland is located in the lower part of the neck, below the Adam's apple, wrapped around the trachea (windpipe).

Picture of the thyroid gland
Picture of the thyroid gland
Medically Reviewed by a Doctor on 2/4/2014

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Diagnostic testing Question: Were you diagnosed with an autoimmune or other type of disorder from your thyroid peroxidase results? Please explain.

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