The normal range of aminotransferases is 0 to 40 U/L, above the normal range may suggest liver damage, but not absolutely. The normal range of aminotransferase, including alanine aminotransferase and glutamic oxalate aminotransferase, is 0 to 40 U/L, and the higher the value, the more serious the liver damage. However, in some special cases, such as liver failure, liver function is severely impaired, but the aminotransferase index is not significantly elevated, or even within the normal range. In healthy people, aminotransferase levels may also be temporarily out of the normal range, e.g. overwork, strenuous exercise, excessive consumption of fatty foods, medications, etc., which may also cause temporary elevation of aminotransferase. In case of liver injury, symptoms such as fatigue, anorexia, jaundice, itchiness and skin rash are usually present, which may help in the diagnosis. Therefore, it is recommended to consult a doctor for further examination in order to identify the cause of the disease and treat the cause.