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Prostate Specific Antigen, also known as PSA, is a protein that men produce to help the movement of sperm. The normal range of PSA is 2.0 to 5.5 ng/ml, depending on the age of the man. For men in their forties, it should be around 2.0 ng/ml, while men in their seventies have a PSA level of around 5.5 ng/ml.
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