Immunology & cytokines

CH50 (total complement) unit converter

Total haemolytic complement activity

Also known as: CH50, Total complement, CH100, Complement function

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

CH50 (total complement) is reported in kU/L or U/mL. The page converts between the units only.

1 U/mL = 1 kU/L; the two notations are interchangeable.
The range shown is a guide from the named source; targets and reference ranges differ between laboratories, methods and indications, so compare with the range on your own report.

Reference range

Unit	Adults
kU/L = U/mL	41.68 – 95.06

Source: Newcastle Hospitals Laboratories: Complement function (CH50/alternative pathway) · Last reviewed: 2026-10-19

Note from the source: 41.68-95.06 U/mL (= kU/L) with the liposomal assay used there (Newcastle Hospitals Laboratories). Values depend strongly on the assay

Frequently asked questions

What is the reference range of CH50 (total complement)?

For adults the range is 41.68 – 95.06 kU/L (Newcastle Hospitals Laboratories: Complement function (CH50/alternative pathway)). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for CH50 (total complement)?

Common units are kU/L.