You can't be sure if you have bacterial or nonbacterial type of prostatitis. It is very difficult to culture bacterias from prostate. Even if you have negative tests results you still can have bacterias. They can be hidden in calcifications or in blocked ducts in prostate.
http://prostate-forum.org
Non-bacterial prostatitis is a diagnosis of exclusion. If you truly have symptoms consistent with prostatitis and no evidence of infection, then the diagnosis can be made.
S.A.Liroff, M.D.
This information is provided for general medical educational purposes only. It
does not necessarily reflect the opinions of Henry Ford Hospital or the
Vattikuti Urologic Institute. Please consult your physician for diagnostic
and treatment options pertaining to your specific medical condition.