Anti-TPO Antibodies
Anti-TPO antibodies are immune markers against thyroid peroxidase, an enzyme of the thyroid gland. Elevated levels indicate autoimmune thyroid disease (Hashimoto's).
Normal ranges
Adults: < 34 IU/mL (lab-specific).
Units: IU/mL
Causes of deviations
Low levels:
Negative result is the norm — no autoimmune activity detected.
High levels:
Hashimoto's thyroiditis, Graves' disease, postpartum thyroiditis.
When to see a doctor
If elevated — check TSH and thyroid ultrasound with an endocrinologist.
This information is for educational purposes and does not replace medical advice.
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