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Urinalysis

Definition

Urinalysis is the physical, chemical, and microscopic examination of urine. It involves a number of tests to detect and measure various compounds that pass through the urine.

Alternative Names

Urine appearance and color; Routine urine test

How the test is performed

A urine sample is needed. Your health care provider will tell you what type of urine sample is needed. For information on how to collect a urine sample, see:

The sample is sent to a lab, where it examined for the following:

Physical color and appearance:

  • What does the urine look like to the naked eye?
  • Is it clear or cloudy?
  • Is it pale or dark yellow or another color?

The urine specific gravity test reveals how concentrated or dilute the urine is.

Microscopic appearance:

  • The urine sample is examined under a microscope to look at cells, urine crystals, mucus, and other substances in the sample, and to identify any bacteria or other germs that might be present.

Chemical appearance:

  • A special stick ("dipstick") tests for various substances in the urine. The stick contains little pads of chemicals that change color when they come in contact with the substances of interest.

See also: Urine chemistry

How to prepare for the test

Certain medicines change the color of urine, but this is not a sign of disease. Your doctor may tell you to stop taking any medicines that can affect test results.

Medicines that can change your urine color include:

  • Chloroquine
  • Iron supplements
  • Levodopa
  • Nitrofurantoin
  • Phenazopyridine
  • Phenothiazines
  • Phenytoin
  • Riboflavin
  • Triamterene

How the test will feel

The test involves only normal urination, and there is no discomfort.

Why the test is performed

A urinalysis may be done:

  • As part of a routine medical exam to screen for early signs of disease
  • If you have signs of diabetes or kidney disease, or to monitor you if you are being treated for these conditions
  • To check for blood in the urine
  • To diagnose a urinary tract infection

Additional conditions under which the test may be performed:

Normal Values

Normal urine may vary in color from almost colorless to dark yellow. Some foods (like beets and blackberries) may turn the urine a red color.

Usually, glucose, ketones, protein, and bilirubin are not detectable in urine. The following are not normally found in urine:

  • Hemoglobin
  • Nitrites
  • Red blood cells
  • White blood cells

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

For specific results, see the individual test article:

What the risks are

There are no risks.

Special considerations

If a home test is used, the person reading the results must be able to distinguish between different colors, since the results are interpreted using a color chart.

References

McPherson RA, Ben-Ezra J, Zhao S. Basic examination of urine. In: McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia, Pa: W.B. Saunders Company; 2006:chap 27.


Review Date: 2/1/2011
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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