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Age and symptoms predict male NGU best
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Young age and symptoms should be included in predictive algorithms of urethral infection; they are better predictors of urethral infection in men than numbers of urethral polymorphonuclear leucocytes (PMNs), an evaluation study of non-gonococcal urethritis (NGU) has disclosed.
The evaluation substituted the ligase chain reaction for PMN count as the diagnostic test for C trachomatis and calculated sensitivity and specificity of the cut offs in PMN count in stained urethral smears as well as the likelihood of PMN count, symptoms, and age predicting C trachomatis urethritis. Over 300 men being screened for sexually transmitted infection at one clinic over four weeks were tested; none had gonococcal urethritis.
Age below 30 versus 40 and above increased likelihood of infection with C trachomatis 13-fold; PMN count, at 
20 per high power field (hpf), sixfold and 5-9 per hpf, threefold; and dysuria threefold. However, the sensitivity of PMN count at 5 per hpf was just 63%
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