It is a rough test..
Psa is useful depending on when, how, and who use it, and gives men a rough idea if they may have high suspicion for prostate cancer
after excluding uti, drug use, etc.
But, unfortunately, it has been over-used, mis-used, and even abused to serve political correctness and commercialism - professional and industrial. More? Go to http://www.Formefirst.Com/newauapsa.Html