What would constitute a normal psa level?

Between 0-4: A normal psa level is between 0 and 4. Howevere, there is an age-adjusted psa level that is different depending on your age. The older a patient is, the higher the psa can become without being too alarming.

Depends on age: Laboratories often report a level of 4 as a "normal" cutoff. This is based on the original research on psa. However, most urologists use age adjusted cutoffs, eg, 2.5 for men in their 40s, 3.5 in 50s, 4.5 in 60s and 6.5 for 70s and up. Rate of rise ("psa velocity") has also been considered important, but recently this has been called into question by the research of vickers at sloan kettering.