Normal CA 125 test results typically measure less than 35 units per milliliter, states Mayo Clinic. Higher-than-normal values may indicate the presence of ovarian, endometrial, peritoneal or fallopian tube cancer.
A number of normal, non-cancerous conditions may also cause elevated CA 125 levels, including endometriosis, liver disease, menstruation, pelvic inflammatory disease and pregnancy, explains Mayo Clinic. In such instances, a doctor may perform other tests and procedures for proper diagnosis.
Cancer patients often undergo he CA 125 test to monitor treatment, with decreasing levels usually indicating the cancer is responding to therapy, and rising levels indicating a return or continued growth of the disease, notes Mayo Clinic.