Serum or plasma uric acid concentration (mass concentration)

Why This Test Might Be Ordered

Your doctor may recommend this test to check for high uric acid levels, which can cause gout or kidney stones. It may also be used to monitor kidney function or diagnose certain metabolic conditions. Sometimes, it’s part of a broader health evaluation, especially if you have symptoms like joint pain, kidney problems, or other signs of metabolic disorders.

What to Expect Before the Test

No special preparation is usually needed, but you might be asked to fast for 8–12 hours before the test if it’s part of a more complex evaluation. Bring any medications you’re taking, as some (like diuretics) can affect uric acid levels. Avoid eating or drinking anything except water during this time if instructed.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a quick pinch, but it’s usually over quickly. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results are compared to a general reference range, but exact values can vary by lab. High levels may signal conditions like gout, kidney disease, or certain genetic disorders. Low levels might indicate liver or kidney problems, though this is less common. Your doctor will discuss the results in the context of your overall health.