CA-125
CA-125 is a protein found on the surface of many ovarian cancer cells. This blood test helps monitor ovarian cancer treatment response or detect recurrence. It can also be elevated in benign conditions.
12 hours
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What the CA-125 test tells you
CA-125 is a large glycoprotein carried on the surface of cells that line the abdominal cavity, the membranes around the lungs, and parts of the female reproductive tract. When any of those surfaces are irritated, inflamed or disturbed, the protein is shed into the bloodstream where it can be measured. That biology explains both what the test is good for and its central weakness: it responds to disturbance of these membranes from almost any cause, not to ovarian cancer specifically.
Its established role is in women who already have a diagnosis of epithelial ovarian cancer. A value taken before treatment provides a baseline; falling values during chemotherapy support that treatment is working; a value that stops falling or begins to climb prompts reassessment. In follow-up after treatment, a consistently rising trend can appear before any change is visible on imaging. It is emphatically not a screening test for healthy women. Screening with CA-125 in women without symptoms has not been shown to reduce deaths from ovarian cancer, and it does lead to anxiety, further scans and operations that turn out to have been unnecessary.
This marker is the biggest false-alarm generator of its group, and it is worth being very clear about why. CA-125 rises with normal menstruation, in endometriosis, with uterine fibroids and ovarian cysts, in pelvic inflammatory disease, during pregnancy, in liver disease with fluid in the abdomen, in heart failure, and after abdominal or pelvic surgery. A raised value in a woman with any of these is common and usually has nothing to do with cancer. The reverse also holds: a minority of epithelial ovarian cancers produce little CA-125, so a normal result cannot rule cancer out. Where a pelvic mass has already been found, the value is used as one input alongside ultrasound, examination and menopausal status, and the trend across repeated tests carries far more weight than any single number.
This test is commonly ordered for women with a pelvic mass, those undergoing ovarian cancer treatment, or as part of recurrence surveillance after successful therapy.
In diagnosed epithelial ovarian cancer, the direction of serial values reflects whether chemotherapy is having the intended effect.
During follow-up after treatment, a consistently rising trend can appear before disease becomes visible on scans.
Combined with ultrasound findings and menopausal status, it contributes to judging how a mass that has already been found should be managed.
A value measured before treatment begins is what later results are compared against, which is what makes the trend interpretable at all.
Reasons your doctor may request the CA-125 test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Assessing a mass or fluid
A pelvic mass already found on examination or imaging that needs further characterisation.
Assessment of unexplained fluid in the abdomen, alongside other investigations.
Treatment response & surveillance
Monitoring the response of diagnosed epithelial ovarian cancer to chemotherapy.
Surveillance for recurrence after completing treatment for ovarian cancer.
Inherited risk
Follow-up in women at high inherited risk, within a plan directed by a specialist.
No fasting window — pick any slot that suits you, online or on WhatsApp.
A DHA-licensed nurse collects your sample at home or in the office — free home collection.
A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.
CA-125 is mainly used to monitor ovarian conditions.
Ranges are a guide — your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Normal menstruation, which raises it transiently in women who are still having periods.
- Endometriosis, uterine fibroids, ovarian cysts and pelvic inflammatory disease.
- Pregnancy, and recent abdominal or pelvic surgery.
- Liver disease with fluid in the abdomen, heart failure, and inflammation of the membranes lining the chest or abdomen from any cause.
- Epithelial ovarian cancer, and some cancers of the fallopian tube, peritoneum, endometrium, pancreas, lung or breast.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests — your doctor decides what it means for you.
What this test cannot tell you
- It is not a screening test for ovarian cancer in women without symptoms; screening with it has not been shown to reduce deaths and leads to unnecessary scans and surgery.
- Menstruation, endometriosis, fibroids, ovarian cysts, pregnancy and liver disease all raise it, so an isolated raised value is a common finding in women who do not have cancer.
- A minority of epithelial ovarian cancers produce little CA-125, so a normal result does not exclude disease.
- A low result carries no meaning of its own and is the expected finding in most people.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1CA-125 reflects irritation of the membranes lining the abdomen and reproductive tract, not ovarian cancer alone.
- 2Its proper use is monitoring known disease, not screening healthy women.
- 3Menstruation, endometriosis, fibroids, ovarian cysts and pregnancy are common and entirely benign reasons for a raised value.
- 4A normal result does not rule cancer out, because some tumours produce very little of it.
- 5The trend across repeated samples matters far more than any single number.
Frequently Asked Questions
Everything you need to know about the CA-125 test. Can't find what you're looking for?
Talk to our team→It is not recommended for that in women at ordinary risk. Too many benign conditions raise it, and large studies have not shown that screening with it reduces deaths from ovarian cancer, while it does lead to further tests and operations that turn out to be unnecessary. Women at high inherited risk are managed under specialist direction rather than by self-testing.
It is a very common one. Endometriosis, fibroids, ovarian cysts, pelvic infection and even ordinary menstruation all raise CA-125, sometimes considerably. Your doctor weighs the value against your imaging, examination and symptoms rather than treating the number on its own.
Because the direction of change is what carries information. A single value tells you little; a series that falls during treatment or rises during follow-up tells you a great deal. That is also why the same laboratory and consistent intervals are preferred, so that a change reflects your disease rather than the method.
Yes. A minority of epithelial ovarian cancers produce little of it, and some other types produce almost none. That is why a normal result is never used on its own to rule out disease when symptoms or imaging raise concern.
CA-125 is a protein found on the surface of many ovarian cancer cells. This blood test helps monitor ovarian cancer treatment response or detect recurrence. It can also be elevated in benign conditions.
This test is commonly ordered for women with a pelvic mass, those undergoing ovarian cancer treatment, or as part of recurrence surveillance after successful therapy.
No, fasting is not required for the Ovarian Cancer Marker test, so you can eat and drink normally beforehand.
The Ovarian Cancer Marker test uses a blood sample, collected quickly by our DHA-licensed phlebotomist with minimal discomfort.
Results for the Ovarian Cancer Marker test are typically ready within 12 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The Ovarian Cancer Marker test is AED 230, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by adults & at-risk groups. If you are not sure it is right for you, our care team is happy to advise.
Add the Ovarian Cancer Marker test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review — just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.