The prostate-specific antigen (PSA) blood test is one way to screen for prostate cancer. This blood test measures the level of PSA in the blood. PSA is a protein made only by the prostate and a prostate cancer. The test can be done in a lab, hospital or provider’s office.
Very little PSA is found in the blood of a man with a healthy prostate. A low PSA is a sign of good prostate health. A rapid rise in PSA may be a sign that something is wrong. Prostate cancer is the most serious cause of a high PSA result. Another reason for a high PSA can be benign (non-cancer) enlargement of the prostate. Prostatitis, inflammation of the prostate, can also cause high PSA results.
A rise in PSA level does not tell us the type of cancer cells present. The rise tells us that cancer may be present and further testing should be performed.