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Leukocyte esterase

Contents of this page:

Illustrations

Male urinary system
Male urinary system

Alternative Names    Return to top

WBC 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:

Update Date: 8/28/2007

Updated by: Daniel R Alexander, MD, Department of Internal Medicine, St. Mary's Hospital, Leonardtown, MD. Review provided by VeriMed Healthcare Network.

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