Glutamyltransferase, a transferase substance, is widely present in human liver, pancreas, kidney and other organ tissues. Its role for the following human systems and tissues is as follows: 1, digestion: glutamyltransferase plays a regulatory role in the production of bile, which is an important decomposition and transformation of nutrients such as proteins, fats and polysaccharides in the human digestive tract. 2, circulatory metabolism: glutamyltransferase plays a role as a pro-oxidant in the human body, and plays a regulatory role in cellular metabolism and toxin excretion in the body. Once its content level is abnormal, it will have a serious impact on the normal circulatory metabolic function of body organs and tissues. In clinical practice, glutamyltransferase tests are an important reference for the diagnosis of liver disease and other disorders. In addition, chronic alcoholism and chemical substances can also cause abnormal levels.