Normal PSA levels differ by age. For men under 50, a PSA level up to 2 ng/mL is considered normal, whereas for men aged 50-59, up to 3 ng/mL is said to be normal.

And some men with prostate cancer have perfectly normal PSA readings. According to a report in the New England Journal of Medicine, 15 percent of a group of 2,950 men with normal PSA levels were ...

Other research has shown that fewer than one-third of men with elevated PSA levels actually had prostate cancer and 15% of men with normal PSA levels did have prostate cancer.

PSA test results after age 65 provide key information on men’s risk for metastatic prostate cancer and cancer death, study findings suggest.