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Normal values vary with age. Older men typically have slightly higher PSA measurements than younger men. African-Americans normally have slightly higher values than white men.
A PSA of 4 ng/ml is typically used to determine the need for further evaluation with a prostate biopsy. Keep in mind that while the PSA test is an important tool for detecting prostate cancer, it is not foolproof. A PSA test does not always detect the presence of cancer. A digital rectal exam should also be performed to check for prostate cancer.
Note: ng/ml = nanograms per milliliter
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