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Table 1 NIH consensus classification and definition of 4 categories of prostatitis [1]

From: Acupuncture for chronic prostatitis/chronic pelvic pain syndrome: study protocol for a randomized controlled trial

NIH consensus classification of prostatitis Definition
(I) Acute bacterial prostatitis Acute infection of the prostate
(II) Chronic bacterial prostatitis Chronic or recurrent infection of the prostate
(III) Chronic prostatitis/chronic pelvic pain syndrome No demonstrated infection
 IIIA Inflammatory CP/CPPS Leukocytes in expressed prostatic secretions, post prostate massage urine, or semen
 IIIB Non-inflammatory CP/CPPS No evidence of inflammation
(IV) Asymptomatic inflammatory prostatitis No subjective symptoms detected, inflammation shown either by prostate biopsy or the presence of leukocytes in EPS/semen during evaluation for infertility or other disorders
  1. NIH National Institutes for Health, CP/CPPS chronic prostatitis/chronic pelvic pain syndrome