Leukocyte esterase is a test used to detect a substance that suggests there are white blood cells in the urine. This may mean you have a urinary tract infection (UTI).
High levels of WBCs in your urine can suggest that you have an infection. In this case, your body is trying to fight off an infection somewhere in your urinary tract. Usually, that means the bladder or the urethra, which is the tube that carries urine from the bladder. Leukocytes in the urine could also suggest a kidney infection.
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