Glutamine is found primarily in the heart, followed by liver tissue, and in skeletal muscle or kidneys. Normal serum levels of glutamine are low. If cells are damaged, this can cause the release of glutamine from the cell plasma into the bloodstream, causing an increase in concentration. If glutamine aminotransferase is elevated, it can be used as an adjunctive test for myocardial infarction and myocarditis. The normal value of glutamic aminotransferase is 0-40 U/L. When glutamic aminotransferase is significantly elevated, a ratio of glutamic aminotransferase to glutamic aminotransferase greater than 1 indicates extensive damage to the liver parenchyma, and healing may be poor. In conclusion, glutamic aminotransferase can be used as a reference for cardiac lesions as well as liver damage.