Glutamyltransferase 64U/L suggests liver function impairment, which may be due to hepatitis, biliary obstructive disease, hepatocellular carcinoma and other diseases. Normal values of glutamyl transferase are male: 11-50U/L, female: 7-32U/L. Serum glutamyl transferase mainly comes from the liver, and it will be elevated when there is hyper-synthesis in the liver or obstruction of bile excretion. 1. Hepatitis: For example, alcoholic hepatitis, that is, hepatitis caused by alcohol consumption. When a large amount of alcohol is consumed, alcohol will damage the liver cells, and the glutamyl transferase in the liver will enter the bloodstream, resulting in an increase in serum glutamyl transferase. 2. Biliary tract obstructive diseases: patients with sclerosing cholangitis, primary biliary cirrhosis, etc., which can lead to biliary tract obstruction, will lead to higher than normal values of glutamyltransferase. 3. Hepatocellular carcinoma: when hepatocellular carcinoma occurs, due to the blockage of bile ducts by cancer cells, liver cells are induced to produce a large amount of glutamyltransferase, and at the same time, cancer cells also produce a large amount of glutamyltransferase, which will lead to glutamyltransferase increase. When the patient’s glutamyl transferase is 64U/L, it is better to go to the hospital for examination to clarify the cause and treat the disease.