Prostate-specific antigen (PSA) is a protein produced by both normal cells and cancer cells of the prostate gland. This means even without cancer, a man will have a level of PSA. What is a PSA test? The PSA test is a blood test that measures a protein that is produced by normal healthy prostate cells and cancerous prostate cells. There is no specific normal or abnormal level of PSA in the blood. In the past, PSA levels of 4.0 ng/mL and lower were considered normal. However, some individuals with PSA levels below 4.0 ng/mL have prostate cancer and many with higher PSA levels between 4 and 10 ng/mL do not have prostate cancer . 3xsKT.

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