Wrong test site: A urine dip stick picks up white blood cells that are present in urine if there is an inflammatory process in the urinary tract. It does so by testing for an enzyme (leukocyte esterase) present in white cells. The urinary system is a filter of the blood stream but usually active white cells are very sticky and would not make it from the circulation to the urine. ?Sinus aspirate?
Answered 9/30/2017
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