PSA is a specific protein produced by the prostate cells. Normally this protein is located only in spermatic ducts, if we are talking about healthy men. Increase of PSA level in the blood may become a red flag and point out the existence of diseases or pathological processes in the prostate.
The test is a screening diagnostic procedure aimed at early detection of prostate cancer. PSA presence in the blood is diagnosed with the blood test. The test is recommended for all the men over 40 on an annual basis.