Anti-TPO
Thyroid peroxidase antibodies are the main antibody that signals Hashimoto's disease.
Why it matters: A high level indicates the immune system has attacked cells in the thyroid. Alongside a raised TSH this suggests Hashimoto's disease; with a normal or near-normal TSH it may mean hypothyroidism develops later.
Source · Cleveland Clinic — what it is, why it matters, related conditions
What is Anti-TPO?
Thyroid peroxidase antibodies are the main antibody that signals Hashimoto's disease.
What might a high or low Anti-TPO mean?
A high level indicates the immune system has attacked cells in the thyroid. Alongside a raised TSH this suggests Hashimoto's disease; with a normal or near-normal TSH it may mean hypothyroidism develops later.
What is the typical reference range for Anti-TPO?
The general-population reference range shown here is < 34 IU/mL. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.