Prostate Specific Antigen (PSA) Test
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A prostate-specific antigen (PSA) test measures the level of PSA in your blood. The prostate is a small gland that is part of a man’s reproductive system. It is located below the bladder and makes a fluid that is part of semen. PSA is a substance made by the prostate. Men normally have low PSA levels in their blood. A high PSA level may be a sign of prostate cancer.