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.
What is the ideal PSA level of a healthy adult male? A: A normal PSA level in an adult male according to the National Cancer Institute is 4.0 nanograms per milliliter or lower. However, studies show some men who... Full Answer >