Prostate Specific Antigen

Prostate Specific Antigen - A protein produced primarily by the prostate gland. A prostate specific antigen (PSA) test is a commonly used test that measures the level of PSA in the blood. Increased levels of PSA may be a sign of prostate cancer, or of another condition. In addition to screening for prostate cancer, PSA testing may be done after prostate cancer treatment to check for signs of recurrence.

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