The normal range for fasting AAT is 5-40 U/L, with slight variations depending on the reagents used in different medical institutions. Diseases or certain physiological reasons can cause the rise of ALT, such as hepatitis A, hepatitis B and other liver diseases; cardiovascular diseases, such as heart failure, myocarditis; biliary diseases, such as cholelithiasis, biliary hemorrhage; typhoid fever, pneumonia and other infectious diseases, or infarction, shock, and other diseases can cause an increase in ALT. If a patient stays up all night before the test, exercises strenuously, or abuses alcohol for a long period of time, it may cause an increase in ALT. In addition, women during pregnancy may also experience an increase in ALT elevation, which is physiological and can be gradually normalized by paying more attention to adjusting their lives. If the results of the test show abnormalities, it is recommended to go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor for targeted treatment or therapy.