Liver function tests generally check for liver damage, but they do not identify the cause of the disease and do not confirm the diagnosis of viral hepatitis. Liver function tests include a variety of bilirubin, aminotransferases, albumin, etc. When the liver is damaged, the earliest thing that may appear is an increase in aminotransferases. However, there are many causes of liver damage, and liver function tests cannot find out the cause of the disease. The common causes of liver damage include viral hepatitis, as well as alcoholic hepatitis and drug hepatitis. Moreover, if you are a hepatitis B carrier or hepatitis C patient, your liver function may still be normal, so the liver function test cannot identify the cause of the disease. To clarify viral hepatitis, we need to further improve the hepatitis virus spectrum, autoimmune hepatitis spectrum, liver, gallbladder and spleen ultrasound, hepatitis B two halves and other related tests to clarify the cause.