CA125 Elevation in Endometriosis Diagnosis
Clinical Significance and Interpretation
- An elevated CA125 in a premenopausal patient with clinical features suggesting endometriosis should not unnecessarily elevate concern for malignancy, as recommended by the American College of Radiology 1, 2
- CA125 has limited specificity as it can be elevated in various benign conditions including endometriosis, adenomyosis, pelvic inflammatory disease, menstruation, and other benign cysts, according to the American College of Obstetricians and Gynecologists 3, 4
Clinical Application
- When evaluating adnexal masses, the O-RADS risk stratification system recognizes that tumor marker evaluation should be individualized, acknowledging that endometriosis can cause CA125 elevation that might otherwise suggest malignancy, as stated by the American College of Radiology 1, 2
- For ovarian cancer surveillance, clinicians should be aware that elevated CA125 levels may be due to other conditions including endometriosis rather than cancer recurrence, as recommended by the American College of Obstetricians and Gynecologists 3, 4
CA-125 Elevation in Endometriosis
Clinical Significance and Diagnostic Utility
- The American College of Radiology O-RADS committee emphasizes that tumor marker evaluation should be individualized, specifically acknowledging that endometriosis can cause CA-125 elevation that might otherwise suggest malignancy in premenopausal women with clinical features consistent with endometriosis 5
- CA-125 has limited specificity and can be elevated in pelvic inflammatory disease, adenomyosis, menstruation, other benign cysts, cirrhosis, and following radiotherapy, with a study published in the American Journal of Obstetrics and Gynecology 6
Common Pitfalls to Avoid
- A normal CA-125 level may provide false reassurance in a postmenopausal woman with an intermediate- or high-risk ovarian lesion, according to the American College of Radiology O-RADS committee 5
- In postmenopausal women, the absence of functional ovarian activity means persistent masses warrant closer evaluation regardless of CA-125 levels, as recommended by the American College of Radiology O-RADS committee 5