Tumor markers

CA 125 unit converter

Cancer antigen 125 (tumor marker, mainly ovarian)

Also known as: Cancer antigen 125, Carbohydrate antigen 125, MUC16, Mucin 16

Converter

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

U/mL = kU/L

Reference range

Unit	Adults
U/mL = kU/L	0 – 35

Source: MedlinePlus (NLM): CA-125 blood test · Last reviewed: 2026-10-14

Note from the source: Above 35 U/mL is considered abnormal (MedlinePlus)

Frequently asked questions

What is the reference range of CA 125?

For adults the range is 0 – 35 U/mL (MedlinePlus (NLM): CA-125 blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for CA 125?

Common units are U/mL.

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