Cancer Antigen 125 (CA 125) Blood Test
Test Code: 002303
Specimen Type: Blood
Cancer Antigen 125 (CA 125) Blood Test (Labcorp)
This test measures Cancer Antigen (CA) 125 in the blood. CA-125 is a protein which is present on the surface of most ovarian cancer cells. Elevated levels of CA-125 are often present in women with ovarian cancer. CA-125 testing is typically done to monitor treatment for ovarian cancer or to periodically check someone who is in remission to see if the cancer may have come back. This test is also used to screen women who have a high risk of developing ovarian cancer due to family history.
It is important to note that other conditions such as pregnancy, menstruation or pelvic inflammatory disease may also cause elevated levels of CA-125. For this reason, CA-125 testing is not typically used as a general screening. In some cases, even when someone has ovarian cancer, they may not show elevated CA-125. In such cases, CA-125 is not a useful marker for monitoring treatment.
Turnaround time for the CA-125 test is typically 1 business day.
Where can I find a Cancer Antigen 125 test near me?
Check our lab finder to locate a collection site in your area.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
It is recommended that collection for the CA-125 test occur at least 3 weeks after primary chemotherapy and at least two months following abdominal surgery.
It is recommended that someone taking Biotin (also known as vitamin B7 or B8, vitamin H, or coenzyme R) stop consumption at least 72 hours prior to the collection of a sample