CA-125

Also known as: Cancer Antigen 125

Women's Health Blood
Patient Friendly Summary

CA-125 is a context marker, not a cancer verdict. Many young women have raised values from completely benign causes like endometriosis. Doctors read it together with ultrasound findings.

What this test means

CA-125 is a protein that can rise with ovarian conditions. It is most useful for monitoring known disease — as a general screening test it has important limitations.

Why it is done

It is done to evaluate ovarian cysts or masses found on scans, monitor treatment response, and follow up after treatment.

Understanding your value

If your value is high

CA-125 can rise in many non-cancer situations — menstruation, endometriosis, fibroids, pelvic infection, even liver disease. A raised value always needs specialist interpretation alongside imaging.

If your value is low

Normal values are generally reassuring in the monitoring context, though no single marker excludes disease.

About the normal range

Many labs use below 35 U/mL as the reference. Timing within the menstrual cycle can influence the value.

When to consult a doctor

Review raised values with a gynecologist along with pelvic imaging; persistent bloating, pelvic pain, or appetite change deserves evaluation regardless of marker values.

Frequently Asked Questions

It is done to evaluate ovarian cysts or masses found on scans, monitor treatment response, and follow up after treatment. Your doctor will decide if this test is right for your situation.

CA-125 can rise in many non-cancer situations — menstruation, endometriosis, fibroids, pelvic infection, even liver disease. A raised value always needs specialist interpretation alongside imaging. This needs clinical correlation — always discuss your report with your doctor.

Normal values are generally reassuring in the monitoring context, though no single marker excludes disease. This needs clinical correlation — always discuss your report with your doctor.

A single value rarely tells the whole story. Results need to be read together with your symptoms, history, and other tests. Please consult your doctor for a proper interpretation.

Quick Facts

  • TestCA-125
  • Short formsCancer Antigen 125
  • Sample typeBlood
  • CategoryWomen's Health

Related Terms

Benign Malignant High Borderline

Specialists

Gynecology & Obstetrics Oncology

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Disclaimer: This information is for patient education only and does not replace medical advice, diagnosis, or treatment. Always consult a qualified doctor.