What is Prostate Specific Antigen PSA

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Prostate specific antigen is a protein produced by prostate cells. It can be detected at low levels in men of all ages, but increases when the prostate enlarges or becomes inflamed.

This protein is called prostate specific antigen because it is made almost exclusively by the prostate. In rare instances, it can also be produced in other tissues (like breast tissue), but the majority of PSA comes from the prostate.