Thyroid
TPO Antibodies
Thyroid peroxidase (TPO) antibodies indicate autoimmune attack on the thyroid gland. Elevated levels are the hallmark of Hashimoto's thyroiditis, the most common cause of hypothyroidism.
TPO antibodies can be elevated years before TSH becomes abnormal.
What It Measures
Antibodies against thyroid peroxidase enzyme.
Reference Ranges
| Status | Range (IU/mL) |
|---|---|
| Optimal | < 9 IU/mL |
| Normal | < 35 IU/mL |
| Borderline | 35–100 IU/mL |
| Out of Range | > 100 IU/mL |
How GATOR Tracks This
Lab Providers
Function HealthLabCorpQuest
Related Biomarkers
This content is for informational purposes only and does not constitute medical advice. Reference ranges may vary by laboratory and individual factors. Consult a qualified healthcare provider for interpretation of your results and treatment decisions.
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