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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.
A test known as urinalysis is performed to check for the presence of leukocyte esterase in urine. It aids in the detection of white blood cells in urine. Later, a microscopic analysis of the urine sample is done for detailed information.A urine test to check for the presence of leukocyte esterase in urine involves the below mentioned steps: 1  A urine sample is asked of the affected individual.t aids in the detection of white blood cells in urine. Later, a microscopic analysis of the urine sample is done for detailed information. A urine test to check for the presence of leukocyte esterase in urine involves the below mentioned steps: 1  A urine sample is asked of the affected individual.