Merck Manual

Please confirm that you are a health care professional

honeypot link
NIH Consensus Classification System for Prostatitis

NIH Consensus Classification System for Prostatitis

Number

Category

Characteristics

Urine Finding

Premassage

Postmassage

I

Acute bacterial prostatitis

Acute symptoms of urinary infection

WBC

+/

+

Bacteria

+/

+

II

Chronic bacterial prostatitis

Recurrent urinary infection with same organism

WBC

+/

+

Bacteria

+/

+

III

Chronic prostatitis /chronic pelvic pain syndrome

Primarily symptoms of pain, voiding, and sexual dysfunction

IIIa

Inflammatory

WBC

+

Bacteria

IIIb

Noninflammatory*

WBC

Bacteria

IV

Asymptomatic inflammatory prostatitis

Discovered incidentally during urologic evaluation (eg, prostate biopsy, seminal fluid analysis) for other conditions

WBC

+

Bacteria

* Previously called prostatodynia.

+/ means possibly present; + means present; means absent.

NIH = National Institutes of Health; WBC = white blood cell.

Data from Krieger JN, Nyberg L, Nickel JC: NIH consensus definition and classification of prostatitis. JAMA 282:236–237, 1999.