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Uric Acid in Urine

How It Feels

There is no pain while collecting a 24-hour urine sample.

Risks

There is no chance for problems while collecting a 24-hour urine sample.

Results

The uric acid urine test measures the amount of uric acid in a sample of urine collected over 24 hours.

The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

Results are usually available in 1 to 2 days.

Uric acid in urine1
Normal:

250–750 milligrams (mg) per 24-hour urine sample

1.48–4.43 millimoles (mmol) per 24-hour urine sample

Women typically have slightly lower uric acid levels than men.

Many conditions can change uric acid levels. Your doctor will talk with you about any abnormal results that may be related to your symptoms and past health.

What Affects the Test

Failing to collect exactly 24 hours of urine during a uric acid urine test can cause inaccurate test results.

High values

High uric acid levels may be caused by:

Low values

Low uric acid levels may be caused by:

  • Gout, when uric acid production is normal but uric acid removal by the kidneys is reduced.
  • Kidney damage or disease that prevents the kidneys from filtering uric acid out of the blood into the urine.
  • Folic acid deficiency or lead poisoning.
  • Not eating enough protein.
  • Some medicines, such as allopurinol, insulin, some diuretics, and high levels of aspirin.
  • Drinking alcohol during the collection period.

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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