The Prostate specific antigen reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Prostate specific antigen

Prostate specific antigen (PSA) is a protein present in the prostate gland of men. It is normally present in the blood at very low levels. Increased levels of PSA suggest the presence of prostate cancer, however, PSA can be also elevated due to prostate infection, irritation, benign prostatic hypertrophy (enlargement) or hyperplasia (BPH), recent ejaculation, etc.

The U.S. Food and Drug Administration (FDA) has approved the PSA test for annual screen of prostate cancer in men of age 50 and older. PSA levels between 4 and 10 ng/mL (nanograms per milliliter) are considered to be suspicious and result in prostate biopsy. PSA is false positive-prone: 7 out of 10 people in this category will not have prostate cancer.

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