Prostate-Specific Antigen (PSA)

[ praa-stayt spuh-si-fuhk an-tuh-jn ]

PSA is a protein produced by the prostate gland and is found in both normal and cancerous prostate cells. Prostate-specific antigen (PSA) test is a blood test that measures the level of PSA in a man's blood.

The PSA test is often used as an early detection tool for prostate cancer. However, an elevated PSA level does not necessarily mean a man has prostate cancer, as it can also be caused by non-cancerous conditions such as an enlarged prostate or inflammation. Similarly, a low PSA level does not necessarily mean a man does not have prostate cancer. PSA levels can fluctuate for various reasons, so a single elevated PSA test result does not necessarily indicate prostate cancer, and follow-up testing is typically needed to confirm a diagnosis.