Mediki
TPO antibodies blood test: what your result means
TPO antibodies measure immune activity against thyroid peroxidase. They are commonly used in autoimmune thyroid evaluation.
- Category
- Thyroid
- Standard unit
- IU/mL
- Reported in
- IU/mL, kIU/L
What does high TPO antibodies mean?
Higher values may suggest autoimmune thyroid inflammation patterns. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low TPO antibodies mean?
Lower or negative values usually suggest less detectable autoimmune thyroid activity. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
TPO antibodies units and conversion
Mediki shows TPO antibodies in IU/mL. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
kIU/L is numerically the same as IU/mL, so no conversion is needed.
Why track TPO antibodies over time?
A single TPO antibodies result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Following TPO antibodies as part of a panel? See the thyroid test tracker.
Track your TPO antibodies results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.