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Day 5/60 Serology Testing - The PSA Score | David Allan Wellness PSA stands for prostate-specific antigen and is a protein produced by the prostate gland. There is no specific normal or abnormal level of PSA in the blood, and levels may vary over time in the same man. In the past, most doctors considered PSA levels of 4.0 ng/mL and lower as normal. Read HERE for more details.