OverviewProstate-specific antigen (PSA) is a glycoprotein in the cytoplasm of prostatic epithelial cells. It can be detected in the blood of all adult men. The PSA level is increased in men with prostate cancer but can also be increased somewhat in other disorders of the prostate.
Update Date 9/19/2011
Updated by: Louis S. Liou, MD, PhD, Chief of Urology, Cambridge Health Alliance, Visiting Assistant Professor of Surgery, Harvard Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.