Prostate-specific antigen (PSA) is a protein produced by the glandular tissue of the prostate (a walnut-sized gland just below the bladder and in front of the rectum in males). PSA levels can be detected in the blood, urine, or semen. Blood PSA testing is used as a screening test for prostate cancer.
The prostate specific antigen (PSA) test is used to measure blood PSA levels and help detect prostate cancer or other prostate abnormalities. Learn more about the PSA blood test at WebMD.
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