The normal value of troponin is less than 0.1 μg/L. Troponin is a specific marker of myocardial necrosis, and an elevated troponin is indicative of myocardial cell necrosis. Troponin is very specific and its sensitivity is not bad, so if it is elevated, myocardial necrosis should be considered. In general, when troponin is elevated, the following diseases should be considered: 1. Acute myocardial infarction. In general, troponin will be elevated 4-6 hours after the appearance of acute infarction, and troponin elevation can be detected by blood sampling, combined with the patient’s symptoms and electrocardiogram to confirm the diagnosis of myocardial infarction. 2, the acute phase of viral myocarditis. The virus invades the myocardial cells and causes myocardial cell necrosis, which also results in elevated troponin.