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Uric Acid in Urine

The uric acid urine test measures the amount of uric acid in a sample of urine collected over 24 hours. Uric acid is produced from the natural breakdown of your body's cells and from the foods you eat.

Most of the uric acid is removed from the body in urine. A small amount passes out of the body in stool. But if too much uric acid is being produced, the level in the urine will increase. If the kidneys are not able to remove it from the blood normally, the level of uric acid in the urine will decrease.

High blood levels of uric acid in the body can cause solid crystals to form within joints. This causes a painful condition called gout. If gout remains untreated, uric acid crystals can build up in the joints and nearby tissues, forming hard lumpy deposits called tophi. High levels of uric acid in the urine can cause kidney stones.

Why It Is Done

A uric acid urine test is done to:

  • Check to see if kidney stones may be caused by high uric acid levels in the body.
  • Find the cause of a high level of uric acid in the blood and help choose the proper treatment.

How To Prepare

No special preparation is required before having a uric acid urine test. It is not necessary to restrict fluids or foods before the test. Be sure to drink enough fluids during the 24-hour urine test to prevent dehydration.

During the collection period, do not drink alcohol, because alcohol reduces the amount of uric acid eliminated by the kidneys.

Many medicines can change the results of this test. Be sure to tell your doctor about all the nonprescription and prescription medicines you take.

Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results may mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).

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WebMD Medical Reference from Healthwise

Last Updated: June 12, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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