The five liver function tests include glutathione, ghrelin, total bilirubin, direct bilirubin and indirect bilirubin, which are commonly known as transaminases and bilirubin. These indicators reflect the conversion, uptake and excretion of liver cells on the one hand, and the patency of the biliary tract on the other. The cost of the five liver function tests is about 20-30 RMB, but of course, the final cost may vary from region to region and from hospital to hospital. However, as the most basic liver function test, the cost of liver function tests is relatively inexpensive and can reflect the basic condition of the liver. However, if there is a significant elevation in the liver function tests, it is important to actively investigate the cause and further ancillary tests may be required. It is also important to maintain a fasting status for the liver function tests, and to avoid eating high-fat, oily foods and drinking alcohol the day before the test, so that these physiological factors do not interfere with the final results.