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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.
Many enzymes are produced by the body to carry out a variety of biochemical reactions. One such enzyme is esterase, which are of different types. One type of esterase is known as âleukocyte esteraseâ. White blood cells secrets this enzyme. Sponsored link. White blood cells protect the body but if leukocyte esterase is found in urine it means there is infection in urinary tract. Kidneys, bladder, ureters and urethra form the urinary system and when analysis of urine shows leukocytes (without nitrates) in urine it indicates infection in the system.