For a brief introduction and guide to abbreviations, see Laboratory Tests: General Remarks.
Anti−thyroperoxidase antibodies (TPOAb) [S/P]
Reference range, target level, or decision threshold
<34 IU/mL (depending on method)!!!; CW
Interpretation of results
↑ Chronic autoimmune thyroiditis (Hashimoto thyroiditis), Graves disease (↑ TRAb confirms the diagnosis), primary hypothyroidism, healthy individuals
Do not routinely measure TPOAb.