Urinalysis in urinary tract infection

Abstract

In 376 children, between 6 months and 5 years of age, with suspected urinary tract infection, 4 parameters of a routine urine examination were correlated with culture reports. In diagnosing urinary infection, the sensitivity and specificity of proteinuria was 79 and 80% respectively, that of bacteriuria 78 and 96% and that of pyuria >10 wbc/hpf 80 and 82% respectively. 61% among the culture positive groups had all these three parameter present, as against only 0.5% in the culture negative group (P<0.001). All these 3 parameters were absent in 70% in the culture negative group, as against 8% in the culture positive group (P<0.001). Bacteriuria in association with either proteinuria or Pyuria >10 Wbc/hpf had 98% specialty is diagnosis. In diagnosis UTI, Pyuria >10 wbc/hpf was significantly more specific (82∶66.6) than the conventional >5 wbc/hpf. Isolated proteinuria, isolated pyuria, isolated bacteriuria and microscopic haematuria were not features of urinary tract infection in children. Urine culture can be more selectively done if the routine urinalysis is well interpreted. In the absence of dependable culture facilities, a routine urine examination can be reliably used in the diagnosis of UTI in children.