Pyuria is defined as the presence of 10 or more white cells per
cubic millimeter in a urine specimen, 3 or more white cells per high-power
field of unspun urine, a positive result on Gram’s staining of an unspun
urine specimen, or a urinary dipstick test that is positive for leukocyte esterase.
1
Sterile pyuria is the persistent finding of white cells in the urine in the absence of
bacteria, as determined by means of aerobic laboratory techniques (on a 5% sheep-
blood agar plate and MacConkey agar plate).

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Please watch: "Germ tube test"
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