TPO Antibodies Test
Antibodies against thyroid peroxidase. The most common marker of autoimmune thyroid disease.
What is TPO Antibodies?
Antibodies against thyroid peroxidase. The most common marker of autoimmune thyroid disease.
TPO Antibodies Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 0.000 – 35.0 IU/mL |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your TPO Antibodies result may mean
Often reflects Hashimoto's (most common) or Graves' disease. Many people have elevated TPO antibodies without overt thyroid dysfunction.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Related Thyroid biomarkers
Markers commonly tested alongside TPO Antibodies.
Frequently asked
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