What is a prostate-specific antigen (PSA) test, and what is a normal PSA level?
The prostate-specific antigen has been a test that’s been around for a little over 25 years. It’s a simple blood test. So we basically take a sample of blood and you look for a protein that’s basically produced by the prostate. The problem is people think a PSA or prostate-specific antigen equals prostate cancer. It actually is something that’s normally expressed in the prostate. So it’s not really something unique to cancer, but we do find it in the blood when patients have cancer often.