The three liver function tests in the entry physical examination usually include alanine aminotransferase, glutamine aminotransferase and glutamyl transpeptidase. 1. Glutaminase: It is usually found in all cells, mainly hepatocytes. When liver cells are destroyed, this index increases significantly. 2. Glutamyltransferase: mainly found in the myocardium and liver. Generally speaking, the amount in serum is relatively small. When there is damage to liver cells, this index will increase significantly, which can be used as an auxiliary examination for heart attack and myocarditis. The index may also increase significantly when there is parenchymal damage to the liver. 3. Glutamyl transpeptidase: Most of this comes from the liver and increases rapidly when extensive hepatocellular damage and necrosis occur. Patients with liver function problems are advised to seek prompt medical attention to avoid delays.