The 11 liver function tests are mainly obtained by blood sampling, which can generally reflect the synthetic, metabolic and secretory functions of the liver, mainly including glutamate transaminase, glutamic oxalacetic transaminase, glutamyl transpeptidase, alkaline phosphatase, bilirubin and other indicators. If glutamyl transaminase and glutamic oxalyl transaminase are elevated, it may indicate hepatocellular damage, which can be seen in various acute and chronic hepatitis. An increase in glutamyl transpeptidase, alkaline phosphatase and bilirubin may indicate biliary system obstruction or hepatocellular jaundice. Increased or decreased total protein, albumin, and globulin may indicate impaired liver synthesis. Before the liver function test, it is important to fast and abstain from food and water after 12:00 p.m. on the previous day, and check on an empty stomach in the morning.