Glutamyl transpeptidase, also known as glutamyltransferase, 45 U/L is a normal value, and if no other indicators are abnormal, there is no major problem. The normal range of glutamyl transpeptidase varies slightly according to individual and reagent variability. Generally, it is 10~60U/L for men and 7~45U/L for women, and 45U/L is a normal value. Glutamyl transpeptidase is mainly found in the liver, kidney, pancreas and other organs of the body. Elevated glutamyl transpeptidase can be categorized into physiological and pathological elevations. 1. Physiological elevation of glutamyl transpeptidase: it is seen in drinking alcohol, staying up late, strenuous exercise or eating too much high protein food, which increases the burden on the liver and leads to its elevation. Generally, there are no obvious symptoms, and after removing the triggers and taking sufficient rest, glutamyl aminotransferase can generally return to the normal level. 2. Pathological elevation of glutamyl transpeptidase: it can be seen in viral hepatitis, cirrhosis, pancreatitis, primary or secondary hepatocellular carcinoma, obstructive jaundice, cholangitis, extra-hepatic biliary tract carcinoma and other diseases, which can cause elevation of glutamyl transpeptidase. Pathologic causes of elevated glutamyltransferase are often accompanied by other symptoms such as fever and abdominal pain. Therefore, 45 U/L of glutamyl transpeptidase is within the normal range and there is no need to be overly nervous. If glutamyl transpeptidase is obviously elevated, it should be combined with other tests such as liver ultrasound, hepatitis B and C measurement, liver function, total protein and other comprehensive judgment before treatment. Usually, people should pay attention to rest, light diet, do not stay up late and smoke and drink, and when hepatitis B or C and other hepatitis is found, it should be regularly rechecked.