Transaminases are one of the important indicators in liver function tests. When a patient has stem cell damage, transaminases present in liver cells can be released into the blood, and the test will produce high transaminase results. Among the diseases that cause elevated aminotransferases, viral hepatitis is infectious, and acute and chronic hepatitis can cause liver cell damage and elevated aminotransferases. There are also various non-infectious diseases that cause elevated aminotransferases. Fatty liver, alcoholic liver disease, cirrhosis and other liver diseases can directly damage liver cells and cause transaminases to rise. Transaminases can be found in various tissues in the body other than the liver, so diseases such as acute myocardial infarction, myogenic diseases such as dermatomyositis, and hyperthyroidism can also damage various tissues in the body and cause various degrees of transaminase elevation. In addition, if a person has taken anti-inflammatory drugs, strenuous exercise, exertion, alcohol consumption, staying up late, fever, etc. before blood sampling, it may interfere with the metabolism of the body and cause a mild transient increase in aminotransferases, which can return to normal after rechecking the aminotransferases after eliminating the above-mentioned adverse factors. Therefore, high aminotransferases only indicate impaired liver function, but cannot determine whether it is infectious.