Blood uric acid is the end product of purine metabolism, too much output in the body, beyond the body’s excretion or excretion is reduced, it can lead to hyperuricemia. The higher the purine content of food, the more uric acid produced by metabolism in the body, so before testing uric acid, we need to pay attention to: a. normal diet the day before, avoid drinking alcohol and eating a lot of high purine food; b. fasting to draw venous blood for laboratory tests; c. pay attention to whether recently taking antibiotics, antihypertensive drugs, diuretics and other drugs that can make uric acid rise; d. avoid strenuous exercise before the test, strenuous exercise can make the body metabolism increase, uric acid Increase. Five, in the non-same day two tests compared, if the two laboratory values are beyond normal, only then can determine the blood uric acid increased.