What Do Low PSA Blood Test Results Indicate?

By Staff WriterLast Updated Apr 7, 2020 8:13:57 AM ET

Low PSA, typically 4 nanograms or less per milliliter of blood, suggests that prostate cancer is not present. A PSA test measures the levels of prostate specific antigen, a protein produced by the prostate, in the blood, according to Health.com.

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