Uric acid - blood

Gout - uric acid in blood; Hyperuricemia - uric acid in blood

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Definition

Uric acid is a chemical created when the body breaks down substances called purines. Purines are normally produced in the body and are also found in some foods and drinks. Foods with a high content of purines include liver, anchovies, mackerel, red meat, shellfish, dried beans and peas, and beer.

Most uric acid dissolves in blood and travels to the kidneys. From there, it passes out in urine. If your body produces too much uric acid or does not remove enough of it, you can get sick. A high level of uric acid in the blood is called hyperuricemia.

This test checks to see how much uric acid you have in your blood. Another test that can be used to check the level of uric acid is a test of your urine.

How the Test is Performed

A blood sample is needed. Most of the time, blood is drawn from a vein located on the inside of the elbow or the back of the hand.

How to Prepare for the Test

You should not eat or drink anything for 4 hours before the test unless told otherwise.

Many medicines can interfere with blood test results.

  • Your health care provider will tell you if you need to stop taking any medicines before you have this test.
  • DO NOT stop or change your medicines without talking to your provider first.

Why the Test is Performed

This test is done to see if you have a high level of uric acid in your blood. High levels of uric acid can sometimes cause gout or kidney disease.

You may have this test if you have had or are about to have certain types of chemotherapy. Rapid destruction of cancerous cells or weight loss, which may occur with such treatments, can rapidly increase the amount of uric acid in your blood.

Normal Results

Normal values are 3.0 to 7.1 milligrams per deciliter (mg/dL) for women and 4.0 to 8.6 mg/dL for men.

For patients being treated for gout, the goal uric acid is either less than 6 mg/dL or 5 mg/dL based on clinical factors.

Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.

The example above shows the common measurement range for results for these tests. Some laboratories use different measurements or may test different specimens.

What Abnormal Results Mean

Greater-than-normal levels of uric acid (hyperuricemia) may be due to:

Lower-than-normal levels of uric acid may be due to:

Other reasons this test may be performed include:

References

Dalbeth N. Clinical features and treatment of gout. In: Firestein GS, McInnes IB, Koretzky GA, Mikuls TR, Neogi T, O'Dell JR, eds. Firestein & Kelley's Textbook of Rheumatology. 12th ed. Philadelphia, PA: Elsevier; 2025:chap 97.

Edwards NL. Crystal deposition diseases. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 252.

Weisbord SD, Palevsky PM. Prevention and management of acute kidney injury. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 29.

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Review Date: 4/1/2025

Reviewed By: Diane M. Horowitz, MD, Rheumatology and Internal Medicine, Northwell Health, Great Neck, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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