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Prostate Cancer - PSA Levels
The PSA test or prostate specific antigen test test tells your doctor the level of prostate specific antigen -- an enzyme made by the prostate -- in your blood.
http://www.prostatecancerweek.org
What exactly does it mean when a person has a high PSA level?
In a healthy male, the PSA should be less than 4 nanograms per milliliter of blood. Anything higher than 4 can indicate prostate cancer.
http://cancer.about.com
The Prostate-Specific Antigen (PSA) Test: Questions and Answers
What is the prostate-specific antigen (PSA) test?
http://www.cancer.gov