Frolic is a playful word with a happy history. It traces back to the Dutch word vroolijk (merry), which in turn evolved from a Middle Dutch combination of vro (happy) and the adjectival suffix -lijc (-ly).
A normal PSA level is considered to be 4.0 ng/mL (nanograms per milliliter of blood). 1  For men in their 50s or younger, a PSA level should be below 2.5 in most cases.  Older men often have slightly higher PSA levels than younger men.
A prostate-specific antigen (PSA) test measures the amount of prostate-specific antigen in the blood. PSA is released into a man's blood by his prostate gland. Healthy men have low amounts of PSA in the blood.The amount of PSA in the blood normally increases as a man's prostate enlarges with age. When combined with a digital rectal exam, the prostate-specific antigen (PSA) test may increase the chance of finding prostate cancer. 2  To learn more, see the topic Digital Rectal Examination (DRE) . 3  A PSA level within the normal ranges does not mean that prostate cancer is not present.