ANSWERS: 1
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  • The range of normal prostate-specific antigen levels varies based upon a man's age, PSA velocity, PSA density and percent free PSA. Previously, 4.0 nanograms per milliliter was considered the cutoff point for normal levels, with higher levels indicative of prostate cancer. But recent studies have showed there is no verifiable "normal" PSA level because of the number of variables involved.

    Source:

    Health Central: PSA Levels

    National Cancer Institute: PSA

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