JAMA : the journal of the American Medical Association
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Comparative Study
Quantitative urinalysis. Diagnosing urinary tract infection in men.
Using a hemocytometer, we determined the number of white blood cells (WBCs) per milliliter in uncentrifuged urine specimens. Uninfected urine usually contained less than or equal to 10(3) WBCs per milliliter, although up to 8 X 10(3) WBCs per milliliter were observed. Infected urine regularly contained greater than 10(4) WBCs per milliliter, and the mean WBC count per millimeter for urine from infected patients was 3.1 X 10(5). ⋯ Valid data are easily obtainable by quantitative urinalysis of uncentrifuged urine specimens. There are obvious differences in WBCs per milliliter, with little overlap between infected and uninfected urine. This method of analysis should replace traditional means of counting WBCs per visual field in a centrifuged, resuspended urine sediment.