Kidney function three is generally clinical fasting blood collection, blood specimens will be sent to the laboratory laboratory tests, generally check creatinine, urea nitrogen and uric acid three, is a more sensitive clinical judgment of renal function of the examination indicators. Creatinine is the product of muscle catabolism, urea nitrogen is the waste excreted from the kidneys after protein food is broken down and metabolized in the body, and uric acid is the waste of purine metabolism. Serum creatinine test is a common method for clinical assessment of glomerular filtration function, the test is fast and easy, but the sensitivity is low and cannot reflect the early kidney damage. In addition, blood creatinine measurement is more accurate than blood urea nitrogen. Blood urea nitrogen is affected by various factors such as catabolism, diet and gastrointestinal bleeding. Uric acid test can reflect the presence of hyperuricemia and the side effects of kidney function. In order to check the accuracy of the results, it is best not to exercise strenuously before the blood test, avoid eating high-fat, high-protein food, avoid eating spicy and stimulating food, and focus on a light diet. Eat as little as possible of animal offal and seafood, etc. If you eat too much before the test, it may lead to abnormal test results and affect the diagnosis of kidney-related diseases. If you want to check your kidney function, we recommend you to go to a regular hospital, consult with a professional doctor, cooperate with the doctor to complete the relevant examination, clarify the cause, and avoid blind treatment.