Description
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.
Precaution
You will need to avoid having sex or masturbating for 24 hours before your PSA test, as releasing semen can raise your PSA levels.