If the result of one blood uric acid measurement is high after the test, it is better to retest again because uric acid is greatly influenced by diet and medication. (1) Patients should have their blood drawn early in the morning on an empty stomach for testing. Strictly speaking, the patient should avoid eating high purine diet such as seafood and animal offal, drinking alcohol and strenuous exercise such as running, fast climbing, carrying weight or carrying burdens 3 days before the blood is drawn, because strenuous exercise can raise the blood uric acid. (2) Avoid drugs that can cause pseudo-increase of uric acid; suspend the application of various drugs that affect kidney function; salicylic acid drugs aspirin, blood pressure lowering drugs, diuretics, Teldene, etc.