Prostate-specific antigen (PSA) blood test

A prostate-specific antigen (PSA) blood test checks for high levels of PSA, a substance (protein) made by the prostate that may indicate the presence of conditions such as prostate cancer. The PSA test can be an indicator prostate cancer earlier than the digital rectal exam, the other major test for the disease. 

PSA tests may be done annually for men over the age of 50 who choose to be tested. Men in high-risk groups, such as African-Americans, or those with a strong family history of prostate cancer, should consult their doctors about being tested at an earlier age.

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