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Alternative Names Return to topWBC esterase
Definition Return to top
Leukocyte esterase is a urine test to look for white blood cells and other signs associated with infection.
How the Test is Performed Return to top
A clean catch urine sample is needed. See: Urine specimen - clean catch
How to Prepare for the Test Return to top
No special preparation is necessary for this test.
How the Test Will Feel Return to top
The test will involve only normal urination, and there is no discomfort.
Why the Test is Performed Return to top
Leukocyte esterase is a screening test used to detect a substance that suggests there are white blood cells in the urine, which likely means a urinary tract infection.
This test is part of the routine urine dipstick test. If this test is positive, the urine should be examined under a microscope for white blood cells and other abnormalities associated with infection.
Normal Results Return to top
A negative test result is normal.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean Return to top
An abnormal result indicates a possible urinary tract infection.
Risks Return to top
There are no risks.
Considerations Return to top
The following may create a false positive result:
False negative tests can be caused by: