Results:  2-3 business days.

Also known as: PSA, Serum.

Most men have PSA levels under four (ng/mL) and this has been used as the cutoff for concern about risk of prostate cancer. Men with prostate cancer usually have PSA levels higher than four, although cancer is a possibility at any PSA level. Reports state that men who have a prostate gland that feels normal on examination and a PSA less than four have a 15% chance of having prostate cancer, and those with a PSA between four and 10 have a 25% chance of having prostate cancer and if the PSA is higher than 10, the risk increases to 67%.