Prostate-specific antigen (PSA) is a substance released into a
man's blood by his prostate gland. A PSA test measures the amount of
prostate-specific antigen in the blood.
Low amounts of PSA may be found in the blood of healthy men. The
amount of PSA in the blood normally increases as a man's prostate enlarges with
age. It is also increased by ejaculation, inflammation of the prostate gland (prostatitis),
and by prostate cancer.
E. Gregory Thompson, MD - Internal Medicine & Christopher G. Wood, MD, FACS - Urology, Oncology
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The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.