CA 15.3

The CA 15-3 test measures the level of cancer antigen 15-3 (CA 15-3) in the blood. CA 15-3 is a protein that is produced by certain types of cancer cells, particularly breast cancer. 

The CA 15-3 Test measures cancer antigen 15-3 levels in blood, often used to monitor breast cancer treatment and progression. Elevated levels may suggest advanced breast cancer, metastasis, or recurrence, while non-cancer conditions can also affect results. Doctors order this test alongside imaging and other labs to track therapy response or detect changes in disease status. Results help guide ongoing management of breast cancer and patient care.