CA-125 (Ovarian Cancer Marker) Test
Category
Cancer Markers
Specimen
Blood
Organ System
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Available At
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About CA-125 (Ovarian Cancer Marker) Test
CA-125 is a protein that can be elevated in the blood of women with ovarian cancer, and it's primarily used as a tool for monitoring known disease and treatment response rather than as a general screening test.
The protein is produced by various tissues throughout the body, not just the ovaries, which means many benign, non-cancerous conditions can also cause CA-125 levels to rise, sometimes substantially — a key limitation that shapes how this test is used clinically.
Because of this lack of specificity, major medical guidelines generally don't recommend CA-125 as a standalone screening test for ovarian cancer in women without symptoms or a known pelvic mass, since it would generate too many false alarms relative to the relatively low rate of ovarian cancer in the general population.
Where it proves most valuable is in women already diagnosed with ovarian cancer, where tracking CA-125 levels over the course of treatment helps doctors assess how well therapy is working and watch for signs of disease recurrence.
When Should You Get CA-125 (Ovarian Cancer Marker) Test
CA-125 testing is typically ordered when there's:
- A pelvic mass identified on ultrasound or other imaging
- Known ovarian cancer requiring treatment monitoring
- Unexplained pelvic or abdominal pain, bloating, or early satiety persisting for several weeks
- Follow-up after ovarian cancer treatment to monitor for recurrence
Conditions CA-125 (Ovarian Cancer Marker) Test Can Detect
CA-125 can be elevated in:
- Ovarian cancer
- Endometriosis
- Uterine fibroids
- Pelvic inflammatory disease
- Normal menstruation and early pregnancy, causing mild elevation
How to Prepare for CA-125 (Ovarian Cancer Marker) Test
- No fasting is required for this test.
- A standard venous blood sample is sufficient.
- Inform your doctor if you're currently menstruating or pregnant, as both can cause mild, non-cancerous elevations.
CA-125 (Ovarian Cancer Marker) Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Normal | Below 35 U/mL |
In women already diagnosed with ovarian cancer, a steadily falling CA-125 during treatment is generally a reassuring sign, while a rising level can be an early indicator of disease recurrence, often appearing before symptoms or imaging changes become apparent.
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Frequently Asked Questions About CA-125 (Ovarian Cancer Marker) Test
Is CA-125 a reliable screening test for all women?
No — it's not recommended as a standalone screening test for the general population, since many benign conditions can also raise CA-125, leading to false alarms. It's most valuable in women with a known pelvic mass or diagnosed ovarian cancer.
Can CA-125 be elevated without cancer?
Yes, conditions like endometriosis, fibroids, pelvic infections, and even normal menstruation can all raise CA-125 to varying degrees, which is why it's interpreted alongside imaging and clinical findings.
How is CA-125 used during cancer treatment?
It's tracked over time as part of monitoring treatment response — a declining trend generally suggests treatment is working, while a rising trend may prompt further investigation for recurrence.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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