Liver and kidney function test can not drink water, need to fast for more than 12 hours. Liver and kidney function test need fasting, otherwise it will affect the test results, many indicators of liver and kidney function test in the case of eating water, the results will be different from the actual; moreover, in the case of eating water, it will stimulate the digestive system, cause the body metabolism of the body to speed up, the metabolism of the body’s substances on the results of the test, and the actual condition of the body does not correspond to the actual situation, it is easy to mislead the clinician’s judgment on the condition of the disease. In addition, the day before the liver and kidney function test, we should eat a light diet, do not eat greasy food, reduce meat food, do not drink alcohol, and ensure sufficient sleep, in order to provide the clinic with test results that are closer to the patient’s actual condition. If you need to check the liver and kidney function, you need to follow the doctor’s instructions to fasting water, so as not to affect the test results.