What Is the CA-125 Marker?
The CA-125 marker is a protein that is often found at higher levels in some patients with cancer. A CA-125 test is a blood test that may be used to evaluate an elevated risk for ovarian cancer or other reproductive cancer in some women, or that can be part of the ways physicians assess how well ovarian cancer is responding to treatment. In this test, blood is tested for increased levels of the CA-125 marker, indicating that cancer may be present.