What is PSA?
Prostate-specific antigen (PSA) is a protein produced by the cells of the prostate gland. The PSA test measures the level of PSA in the blood. Because PSA is produced by the body and can be used to detect disease, it is sometimes called a biological marker or tumor marker.
Who should be tested?
It is normal for men to have low levels of PSA in their blood; however, prostate cancer or benign (not cancerous) conditions can increase PSA levels. As men age, both benign prostate conditions and prostate cancer become more frequent.
Several risk factors increase a man’s chances of developing prostate cancer.