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The CA 125 Test measures the level of cancer antigen 125 in blood, a protein often elevated in ovarian cancer and some other conditions. While not used alone for diagnosis, it helps monitor treatment effectiveness, detect recurrence, or assess disease progression. Elevated CA 125 may also be seen in endometriosis, fibroids, or pelvic inflammation. Doctors use this test to support cancer management and track overall reproductive and abdominal health.