What Blood Test Tests for Ovarian Cancer?

A blood test that tests for ovarian cancer primarily measures the level of CA-125 (cancer antigen 125) in the bloodstream, often combined with HE4 (human epididymis protein 4) and calculated through the ROMA (Risk of Ovarian Malignancy Algorithm) score. While no single blood test can definitively diagnose ovarian cancer Today, these biomarkers serve as critical screening and monitoring tools when used alongside pelvic imaging and clinical evaluation. At anylabtests.com, we provide direct-access blood testing for these markers to help you track your health proactively.

Understanding the Primary Blood Test: CA-125

CA-125 is a protein produced by certain cells in the body, particularly by ovarian cancer cells. A CA-125 blood test measures the amount of this protein in your blood. Elevated levels can indicate ovarian cancer, but they can also be caused by non-cancerous conditions such as endometriosis, uterine fibroids, pelvic inflammatory disease, pregnancy, or menstruation. Today, CA-125 remains the most widely used blood test for ovarian cancer screening in high-risk women and for monitoring treatment response.

When CA-125 Is Most Useful

• For women with a strong family history of ovarian or breast cancer (especially BRCA1/BRCA2 mutations).
• For monitoring recurrence after treatment—rising CA-125 levels often signal a return of cancer before symptoms appear.
• As part of a multimodal screening strategy combined with transvaginal ultrasound for postmenopausal women.
• For symptomatic women presenting with bloating, pelvic pain, or unexplained weight loss.

The Role of HE4 and ROMA Score

HE4 is a newer biomarker that is less affected by benign gynecologic conditions than CA-125. When CA-125 and HE4 are measured together, the ROMA score provides a more accurate risk assessment for epithelial ovarian cancer. The ROMA algorithm calculates the probability of malignancy based on biomarker levels and menopausal status. Today, many clinics and direct-access labs like anylabtests.com offer the ROMA index as a standard panel.

Accuracy Comparison of Key Markers

Other Blood Tests That May Be Ordered

In addition to CA-125 and HE4, your healthcare provider might order a complete blood count (CBC) to check for anemia, a comprehensive metabolic panel to assess kidney and liver function, and a human chorionic gonadotropin (hCG) test to rule out pregnancy. For women with a known genetic mutation, testing for circulating tumor DNA (ctDNA) is emerging as a promising tool Today, though it is not yet standard for initial screening.

Limitations You Should Know

No blood test for ovarian cancer is perfect. False positives can cause unnecessary anxiety and invasive procedures. False negatives can delay diagnosis. That is why anylabtests.com emphasizes that these tests are best used as part of a comprehensive evaluation with your doctor. The U.S. Preventive Services Task Force currently does not recommend routine screening for ovarian cancer in average-risk women due to the high rate of false positives. However, for high-risk individuals, regular CA-125 and HE4 testing can be life-saving.

How to Order Your Test at anylabtests.com

We offer the Ovarian Cancer Risk Panel (CA-125 + HE4 + ROMA) without a doctor's visit required. Simply order online, visit a local lab near you, and receive secure results in 1–2 business days. Our panels include updated reference ranges based on the latest clinical guidelines. If your results are elevated, we provide a physician-reviewed interpretation guide to help you discuss next steps with your healthcare provider.

Take control of your health today. Order the Ovarian Cancer Risk Panel at anylabtests.com and get the clarity you need. Early detection saves lives—start your journey now.