The clinical significance of nitrite test and bacterial staining microscopy in diagnosis of urinary tract infection

Objective To evaluate the use of nitrate test and bacterial staining microscopy in the diagnosis of urinary tract infection(UTI).Methods Mid-stream urine underwent bacterial quantitative culture and urine routine tests by nitrite determination and staining microscopy.Results The nitrite test showed its sensitivity for UTI was 62.8%,specificity 96.3%,positive predictive value 75.9% and negative predictive value 93.3%.It was shown in staining microscopy that the sensitivity for UTI was 85.7%,specificity 94.1%,positive predictive value 73.2% and negative predictive value 97.3%.For combination of the two means the sensitivity for UTI was 57.1%,specificity 99.7%,positive predictive value 97.6% and negative predictive value 92.6%.Conclusion The combination of the two means could be used for rapid diagnosis of UTI.