Glutamine aminotransferase 64 U/L is not considered serious and suggests a mild elevation. The normal value of glutamic aminotransferase is within 40 U/L. If the test result of glutamic oxal transaminase is 64 U/L, it suggests a mild elevation, which is not very serious and does not meet the diagnostic criteria for liver injury. However, a complete examination is needed to clarify the cause of the elevated glutamic aminotransferase. If the liver cells are damaged, it can lead to elevated AST. There are many causes of hepatocellular damage, such as fatty liver, alcoholic liver disease, viral hepatitis, parasitic liver disease, etc., which should be clarified by further refinement of tests such as blood sampling and liver imaging. If the skeletal muscle or cardiac muscle is damaged, the glutamine aminotransferase will also be elevated, such as the occurrence of rhabdomyolysis, myocardial infarction, myocarditis and other diseases, should be further improved electrocardiography, blood sampling, cardiac ultrasound and other tests to clarify. If the test result of AST is abnormal, it is recommended to consult a doctor in time to clarify the cause of the disease, and then carry out targeted treatment or therapy under the guidance of the doctor.