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Leukocyte esterase Article
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Leukocyte esterase urine-culture-clean-catch
Definition
Leukocyte esterase is a urine test to look for white blood cells and other signs associated with infection.
Alternative Names
WBC esterase
Why the Leukocyte esterase is Performed
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.
How the Leukocyte esterase is Performed
A clean catch urine sample is needed. See: Urine specimen - clean catch
How to Prepare for the Leukocyte esterase
No special preparation is necessary for this test.
How the Leukocyte esterase Will Feel
The test will involve only normal urination, and there is no discomfort.
Risks
There are no risks.
Considerations
The following may create a false positive result:
- Vaginal secretions (such as blood or heavy mucus discharge)
- Trichomonas infection (such as trichomoniasis)
False negative tests can be caused by:
- High levels of protein
- High levels of vitamin C
Normal Results
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
An abnormal result indicates a possible urinary tract infection.
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