Oncology• Updated 21 October 2026

CA-125 Test

A blood test for a protein that can be raised in ovarian cancer and some other conditions.

Results: Usually within a day Specimen: Blood

Quick Summary

Primary Purpose

To help assess an ovarian mass and monitor ovarian cancer treatment.

What It Measures

CA-125 level.

Preparation

No preparation needed.

CA-125 isn't reliable for screening the general population.

Periods, endometriosis, fibroids and liver disease can also raise it.

Blood level.

01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.

Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.

Parameter	Typical Range (Adult)	Units
CA-125	Below 35	U/mL

Discuss with Doctor

Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.

Raised levels need further assessment with scans.

Last updated 21 October 2026. For more detail, see these trusted health organisations.