Serum or Plasma Immunoassay for Uric Acid (Concentration)

Why This Test Matters

Uric acid is a waste product that your kidneys normally filter out of your blood. High levels can indicate kidney problems, gout, or other health conditions. Low levels may suggest certain metabolic disorders. Your doctor may order this test if you have symptoms like joint pain, kidney issues, or if you’re at risk for conditions like gout.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Avoid alcohol and certain medications (like diuretics) for 24 hours before testing. Drink plenty of water the day before to help your kidneys function normally.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis using an immunoassay method to measure uric acid concentration.

What the Results Mean

Results are reported as a concentration in milligrams per deciliter (mg/dL). Your doctor will compare your results to standard ranges and discuss them in the context of your health history, symptoms, and other tests. High levels may trigger further evaluation for kidney disease or gout.