Glutathione is mostly found in the liver cells of our body and can reflect the state of our liver function and whether there is necrosis of liver cells in a more sensitive way. If a patient’s blood is drawn for liver function, and if it indicates that the patient’s GLTA is above 40U/L, the patient is considered to have liver insufficiency; if the patient is above 100U/L, the patient is considered to have underlying liver disease, such as whether the patient has viral hepatitis, whether the patient has autoimmune hepatitis, and whether the patient has biliary obstruction causing the patient’s liver function to deteriorate. If the patient has viral hepatitis, and if the patient has viral replication, and if the patient has elevated glutathione and glutamic acid transaminases, the patient needs to actively consider liver preservation therapy and antiviral therapy. In addition, if the patient has poor liver function due to biliary obstruction, we need to actively look for the cause of biliary obstruction, whether it is caused by stones or tumor disease of the biliary tract.