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Uric acid is a natural waste product that forms when the body breaks down purines, which are substances found in certain foods and drinks as well as in human cells. Under normal circumstances, uric acid dissolves in the blood, passes through the kidneys, and leaves the body in urine. However, when the body produces too much uric acid or the kidneys cannot eliminate it efficiently, uric acid levels in the blood can become elevated, a condition known as hyperuricemia.

A uric acid blood test measures the amount of uric acid present in the bloodstream. Healthcare providers commonly order this test to diagnose and monitor gout, a painful form of arthritis that occurs when uric acid crystals accumulate in the joints. The test is also used to evaluate kidney function, monitor patients undergoing chemotherapy who may be at risk for tumor lysis syndrome, and investigate the causes of recurring kidney stones. Some people with elevated uric acid levels may not experience any symptoms, while others may develop severe joint pain, swelling, and redness, particularly in the big toe.

The uric acid test requires a simple blood sample, typically drawn from a vein in the arm. Patients may be asked to fast for several hours before the test, as food intake can temporarily affect uric acid levels. Normal uric acid levels generally range from 3.5 to 7.2 milligrams per deciliter for men and 2.6 to 6.0 milligrams per deciliter for women, though reference ranges may vary slightly between laboratories. Elevated levels may indicate gout, kidney disease, metabolic syndrome, or certain types of cancer, while unusually low levels are less common but can occur with certain liver diseases or as a result of some medications.

Managing uric acid levels often involves dietary modifications and lifestyle changes. Reducing consumption of purine-rich foods such as red meat, organ meats, certain seafood, and alcoholic beverages can help lower uric acid levels. Staying well-hydrated, maintaining a healthy weight, and limiting intake of sugary drinks and foods high in fructose are also beneficial strategies. In some cases, medications may be prescribed to either reduce uric acid production or increase its elimination through the kidneys. Regular monitoring through uric acid testing helps ensure that treatment approaches are effective and allows healthcare providers to adjust management strategies as needed.