Thyroid Function
Normal range < 35 (negative) IU/mL (< 35 kIU/L SI). Specimen: Serum.
Also known as: anti-TPO, antithyroid antibodies.
This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.
| Specimen | Serum |
|---|---|
| Conventional range | < 35 (negative) IU/mL |
| SI range | < 35 kIU/L |
| Conversion factor | ×1 (conventional → SI) |
| Panel | Thyroid Function |
Convert any Thyroid Peroxidase Antibody (TPO Ab) result between units on the unit converter.
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
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