 [ Symptoms ] how does a doctor diagnose tuberculosis [ Disease ] in general a psa level of 2 3 ngml is a normal and good psa reading for an 80 year old man some studies have suggested that if a man lives to 70 75 years and still has a psa reading less than 3 0 ngml then no further testing is needed during his lifetime since his risk for serious prostate cancer is very low however if you are concerned you should see a urologist