The bile acid test is a program in which venous blood is drawn to check serum total bile acids. Bile acids are a group of metabolic products of cholesterol breakdown in the liver and in the hepatic and intestinal circulation. They are the end products of cholesterol breakdown and metabolism in the liver, and they also promote digestion and absorption of lipids, inhibit cholesterol precipitation in bile and the formation of crystals, and they can also promote the excretion of water and other substances, and enhance pancreatic lipolysis. Generally speaking, fasting is required when checking the serum total bile acids, so as not to affect the test results after eating, and when the test results are elevated during the examination, it is also necessary to combine with other test results to make a judgment, and if necessary, it is also necessary to carry out the liver and gallbladder ultrasound, liver and gallbladder ct or magnetic resonance examination, in order to make a clear diagnosis. It is recommended to follow the doctor’s instructions to choose the appropriate treatment program according to the specific test results, in order to achieve the goal of curing the disease.