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What Are Normal PSA Levels by Age? | Reference.com
Normal prostate-specific antigen levels go up to 2.5 nanograms per milliliter for ages 40 to 49, 4.0 nanograms per milliliter for 50 to 59, 4.5 nanograms per milliliter for 60 to 69 and 6.5 nanograms per milliliter for 70 to 79, according to MedicineNet.
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