What does a CA 125 blood test check for?
Cancer Antigen 125 is a protein found on the surface of most ovarian cancer cells, but not all. In certain instances, this makes the test useful as a tumor marker. The CA-125 test determines how much CA-125 is present in the blood.
CA-125 concentrations in the blood of an ovarian cancer patient may be significantly increased. As a result, the test could be used to track the success of treatment and/or check for cancer recurrence. However, because not all women with ovarian cancer have increased CA-125, the test may not be appropriate in all circumstances.
Ovarian cancer is the fifth leading cause of death among women. According to the American Cancer Society, a woman's lifetime risk of acquiring ovarian cancer is roughly 1 in 75, with a 1 in 100 chance of dying from it. According to the American Cancer Society, around 22,000 new cases are identified each year in the United States, with approximately 14,000 women dying as a result.