Background
: Clinicians are based on routine urinalysis when they treated urinary tract infection as primary laboratory finding. In this study we analyzed the relationship between routine urinalysis and the results of urine cultures in order to identify predictors of cultures result in the diagnosis of UTI.

Methods : Bacteriuria, pyuria and nitrite test as predictors of UTI's in patients, who were not tooked medication, were eveluated in 158 visits in one hospital, using a positive urine culture as a gold standard.

Results : The overall culture positivity rate was 34.8%(55 out of 158 cases). A difference was not found between ages(P>0.05). The sensitivity and specificity of microscopic bacteriuria were 78.2% and 79.6%, repectively. The results of nitrite of nitrite test were 50.9% and 87.3%. The validity of pyuria was increased by increasing number of WBC, but specificity was higher than sensitivity. Urine tests consisting of a positive nitrite test, microscopic bacteriuria, microscopic WBC>15/HPF, the sensitivity and specificity were 34.8% and 89.5%, respectively.

Conclusion : Sensitivity and specificity of bacteriuria and specificity of nitrite test were contributed the highest validity in the prediction of urine culture result.