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.
Men with a high PSA level are more likely to have prostate cancer than men with low levels, though there are no normal and abnormal ranges of PSA in the blood. In the past, a PSA reading of 4 ng/mL and below was considered normal.