For the examination of liver and bile acids, including liver function tests, it is recommended that patients have their blood drawn in the morning on an empty stomach without food or water, and the results are more accurate. For liver function, it mainly includes glutamic aminotransferase, glutamic oxalacetic aminotransferase, as well as bilirubin, albumin, total protein, alkaline phosphatase, GGT and other related indicators. If the patient is tested after eating, it will affect the liver function and further affect the accuracy of the patient’s liver function results. If the patient drinks or eats, it will cause the patient’s transaminases to rise, and the results of such a test will have poor clinical guidance. Therefore, if a patient wants to check the liver function, especially the results of the liver bile acid test. If the premise is correct, it is recommended that patients should be examined in the morning on an empty stomach, without food or water. In addition, for some patients who have a physical examination, it is also necessary to check the ultrasound of the upper abdomen. The ultrasound of the upper abdomen to observe the situation in the patient’s gallbladder and in the biliary tract also requires a morning fasting, in a state of no drinking and no eating.