Physical examination requires fasting time of at least 6-8h, because if it is not fasting or fasting time is not enough, it will affect the accuracy of the physical examination results, which will directly affect the biochemical examination in the blood and the abdominal ultrasound. Specifically, it can affect blood glucose, triglycerides, cholesterol, and LDL in blood lipids, all to varying degrees. If you drink too much alcohol the night before, it will affect the liver function test in the blood test, and the transphthalase will be elevated to varying degrees, because alcohol is metabolized by the liver and kidneys, and excessive alcohol consumption will cause damage to liver function and affect the test results. Abdominal ultrasound also requires fasting, the gallbladder after eating can not see the lesion clearly, in addition to the gastroscopy enteroscopy also have special requirements.