Normal range < 35 (negative) IU/mL (< 35 kIU/L SI). Specimen: Serum.
Also known as: anti-TPO, antithyroid antibodies.
< 35 (negative) IU/mLReference range
Reference range
This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.
Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Thyroid Peroxidase Antibody (TPO Ab); those can be narrower than the band shown.
Convert any Thyroid Peroxidase Antibody (TPO Ab) result between units on the unit converter.
What is the normal range for Thyroid Peroxidase Antibody (TPO Ab)?
The standard teaching reference range for Thyroid Peroxidase Antibody (TPO Ab) is < 35 (negative) IU/mL in conventional units, or < 35 kIU/L in SI units. This value is measured in serum.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
Above the range
What causes a high Thyroid Peroxidase Antibody (TPO Ab)?
A positive result supports an autoimmune cause of thyroid dysfunction.
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