
Thyroid Peroxidase Test
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 glandMedically Reviewed by a Doctor on 2/4/2014
Thyroid Peroxidase Test IndexPatient Comments Viewers share their comments
Diagnostic testing Question: Were you diagnosed with an autoimmune or other type of disorder from your thyroid peroxidase results? Please explain.
Medical Author:
Robert Ferry Jr., MDRobert Ferry Jr., MD, is a U.S. board-certified Pediatric Endocrinologist. After taking his baccalaureate degree from Yale College, receiving his doctoral degree and residency training in pediatrics at University of Texas Health Science Center at San Antonio (UTHSCSA), he completed fellowship training in pediatric endocrinology at The Children's Hospital of Philadelphia.
Medical Editor:
William C. Shiel Jr., MD, FACP, FACRWilliam C. Shiel Jr., MD, FACP, FACR
Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
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