Myocardial triple test, i.e. myoglobin, troponin and creatine kinase isoenzyme, is an important index for checking myocardial enzyme spectrum, and is mostly used for determining the existence of myocardial injury diseases such as myocarditis or myocardial infarction in the examinees. 1. Myoglobin: Myoglobin is one of the earliest markers to be elevated after myocardial injury, and its concentration starts to rise within 2~4 hours after myocardial injury, and myoglobin concentration reaches the peak at 12 hours after the onset of myocardial injury. The value of myoglobin is one of the important indicators for early diagnosis of myocardial injury. 2. Troponin: Troponin has relatively high sensitivity to myocardial injury, and its increase is more obvious in 3~8 hours after myocardial injury, which is a highly sensitive indicator for diagnosing myocardial injury. 3. Creatine kinase isoenzyme: Creatine kinase isoenzyme usually shows more obvious elevation in 4~6 hours after myocardial injury, and its concentration peaks in about 16~24 hours, which is a highly specific indicator for diagnosing myocardial injury. Myocardial triple test is an important indicator for diagnosing myocardial injury disease, if an individual has symptoms of myocardial injury such as chest pain, he or she can be clearly diagnosed through the examination of myocardial triple test, so as to carry out targeted treatment as soon as possible.