If the display value of alanine aminotransferase is 199U/L and the display value of alanine aminotransferase is 242U/L, which is more than the normal value, the high value of both of them may be caused by factors such as liver disease, heart disease, and so on. 1. The reference value of AST is between 5~40U/L, but the normal value varies between different kits and different laboratories. The value of 199U/L is on the high side. When the patient suffers from liver diseases, such as viral hepatitis, alcoholic liver, etc., it may trigger high alanine aminotransferase. 2. The reference value of AAT is between 0~40U/L. If the value of AAT is 242U/L, the value of the patient is on the high side, which is usually related to heart diseases, such as acute myocardial infarction, myocarditis, etc. Liver diseases can also cause AAT increase, such as viral hepatitis, fatty liver, etc. If the patient has AAT or AST or AST, the value is on the high side. If the value of alanine aminotransferase or aliquot aminotransferase is elevated, the patient should go to the hospital in time for relevant examinations to clarify the cause of the disease and follow the doctor’s instructions to standardize the treatment.