In patients with the presence of myocarditis, there may be positive markers of myocardial damage, such as elevated cardiac creatine kinase and increased troponin I or troponin T may be present. However, it is not always the case that the absence of cardiac enzymology means that the patient does not have myocarditis. Sometimes it is possible that the cardiac enzymes have returned to normal levels by the time the patient is measured, so they do not show a positive marker. For patients with myocarditis, the gold standard test is an endomyocardial myocardial biopsy. For patients who cannot undergo endomyocardial myocardial biopsy, cardiac magnetic resonance examination is also an option. The diagnostic value of cardiac magnetic resonance for the diagnosis of myocarditis is relatively high. If the cardiac enzymes are positive, the patient is highly considered to have myocarditis, while there are some patients who have myocarditis but have normal cardiac enzymes.