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You may have an infection. A positive finding of the enzyme leukocyte esterase in urinalysis indicates the presence of white blood cells in the urine. This normally suggests inflammation of some sort, often from a urinary tract infection. A simple dipstick test as part of a urinalysis can detect the presence of this enzyme.
URL of this page: //medlineplus.gov/ency/article/003584.htm. Leukocyte esterase is a urine test to look for white blood cells and other signs of infection. A clean-catch urine sample is preferred. The clean-catch method is used to prevent germs from the penis or vagina from getting into a urine sample.