CA 15-3 breast cancer test measures the level of CA 15-3 in the blood. Doctors refer to the CA 15-3 test as a tumor marker for breast cancer as it indicates the presence of breast cancer in the body. The test can help monitor how breast cancer treatment is working and detect the recurrence of cancer after the treatment. CA 15-3 is a blood test used in the diagnosis and monitoring of breast cancer. It measures the levels of a protein called cancer antigen 15-3 (CA 15-3) in the blood. The CA 15-3 antigen is normally found in breast tissues; however, an increased level indicates that breast cancer is present or has spread to other parts of the body. The CA 15-3 cancer test is also known as the breast cancer marker blood test because the CA 15-3 antigen is recognized as a breast cancer marker. In general, a higher level of CA 15-3 indicates that breast cancer is spreading to other parts of the body, such as the lungs and bones. A decrease in CA 15-3 indicates that the cancer or tumor is getting smaller and the treatment is working.

Measures the level of CA 15-3 antigen in the blood, indicating the presence and progression of breast cancer.

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