Gamma-glutamyl transpeptidase 174 U/L is considered elevated, with reference values: 11-50 U/L for men and 7-32 U/L for women. High gamma-glutamyl transpeptidase may be related to biliary tract obstruction, liver disease, alcohol consumption and other factors. The details are as follows: 1. Biliary tract obstruction: γ-glutamyl transpeptidase is mainly excreted through the biliary tract. If the bile duct is obstructed, it will cause γ-glutamyl transpeptidase excretion to be blocked and backflow into the blood, which will also cause high blood levels. 2. Liver diseases: such as cirrhosis and viral hepatitis. When liver cells or liver function are damaged, γ-glutamyl transpeptidase is released into the blood, and the index will be high. 3. Alcohol consumption: If a large amount of alcohol is consumed, it will lead to liver function abnormality, cause liver cell damage, and then the γ-glutamyl transpeptidase is high. If γ-glutamyl transpeptidase is high, it is recommended to consult a doctor in a timely manner, complete the relevant examinations, identify the cause of the disease and treat it as soon as possible in order to avoid delaying the condition.