Table 1.

Comparison of the Results of Diagnostic Test in Relation to the Presence of a Positive Urine Culture Result

Hemocytometer WBC Counts ≧10 WBCs/μLStandard UA ≧5 WBCs/hpfCRP >20 mg/LESR >30 mm/hPeripheral WBC >15 000/μL
Sensitivity82%59%59%73%36%
Specificity94%93%90%78%80%
Accuracy92%88%86%77%74%
LR(+)12.78.35.93.31.8
LR(−)  .19 .44 .45 .35 .80
  • LR(+) indicates likelihood ratio for positive test result; LR(−), likelihood ratio for negative test result.