Thyroid

Anti-TPO antibodies unit converter

Antibodies against thyroid peroxidase (autoimmune thyroid disease)

Also known as: TPO antibodies, Anti-thyroid peroxidase, TPO-Ak, TPOAb

Converter

Enter a value in any unit and all other units fill in.

kU/L = U/mL

Conversion formulas

Equivalent notations	kU/L = U/mL	1 : 1

Good to know

Anti-TPO antibodies are reported in kU/L or in U/mL, which are numerically identical.

1 kU/L = 1 U/mL.
The cut-off differs between assays, so compare your result with the limit printed on your own report.

Reference range

Unit	Adults
kU/L = U/mL	0 – 20

Source: Newcastle Hospitals Laboratories: Anti-thyroid peroxidase, serum · Last reviewed: 2026-10-19

Note from the source: Below 20 kU/L (= U/mL) (Newcastle Hospitals Laboratories); the cut-off depends on the assay

Frequently asked questions

What is the reference range of Anti-TPO antibodies?

For adults the range is 0 – 20 kU/L (Newcastle Hospitals Laboratories: Anti-thyroid peroxidase, serum). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Anti-TPO antibodies?

Common units are kU/L.