CA-125cancer
Cancer Antigen 125
A tumour marker sometimes used in ovarian conditions.
What it measures
The level of CA-125 protein in the blood.
Why it is ordered
To help monitor certain ovarian conditions and cancers.
How to prepare
No special preparation needed.
What happens during the test
A blood sample is drawn from a vein.
Normal ranges
| Group | Normal range |
|---|---|
| Normal | ≤ 35 U/mL |
Ranges vary slightly between laboratories.
What abnormal results may mean
Raised CA-125 can occur in ovarian and some other conditions — not a stand-alone diagnosis.
Related conditions: Ovarian conditions
Related tests: Ultrasound
⚠️ Important: Abnormal results do not mean you have a disease. Always discuss your results with your doctor.