http://stpeteurology.com/prostate-cancer/ Dr. Christos Politis of St Pete Urology discusses about PSA Test. It is a simple test that measures the amount of prostate-specific antigen a man has in his blood. Understand that having a low PSA score does not always mean that a man does not have prostate cancer, just as having a high number does not always mean that he does have prostate cancer.
