Cancer antigen 15-3
Cancer antigen 15-3 (CA 15-3) is a protein produced by normal and cancerous cells. It is typically used to monitor breast cancer progression and reoccurrence. CA 15-3 can also be elevated in some non-cancerous conditions such as liver disease, sarcoidosis, and lupus as well as other forms of cancer. Fasting is not required for this test. Take all medications as prescribed.