Cardiac enzymes in children are generally referenced to the adult index, but are slightly higher than in adults. The normal range for creatine kinase (CK) is 26 to 174 IU/L, creatine kinase isoenzyme (CK-MB) is 0.8 to 5.0 μg/L, lactate dehydrogenase (LDH) is 95 to 200 IU/L, aspartate aminotransferase (AST) is 8 to 40 IU/L, and a-hydroxybutyrate dehydrogenase (a-HBD) is 61 to 155 U/L. Cardiac enzymes, in fact, is not a kind of enzyme, it is a general term for many kinds of enzymes, that is, they all grow in the heart, that’s why they are called cardiac enzymes. There is no standardized value for children’s cardiac enzymes, generally referring to the adult index, but slightly higher than adults. The values also vary slightly between monitoring methods. Generally only significantly elevated values are diagnostic. The normal range for creatine kinase (CK) in adults is 26~174 IU/L, creatine kinase isoenzyme (CK-MB) is 0.8~5.0 μg/L, lactate dehydrogenase (LDH) is 95~200 IU/L, aspartate aminotransferase (AST) is 8~40 IU/L, and a-hydroxybutyrate dehydrogenase (a-HBD) is 61~155 U/L. If the child is only increased cardiac enzymes, there is no crying, loss of appetite, poor spirit and other symptoms, mothers and fathers can not panic for the time being, cooperate with the doctor to check the treatment, myocarditis is unlikely.