There is no standardized time to get an ECG, it can be done whenever it is needed, although it is recommended that ECGs be performed at the onset of symptoms to facilitate the diagnosis and identification of the disease. An ECG is used to check for myocardial ischemia, arrhythmia, and enlargement of the heart by capturing the electrical activity of the heart. Therefore, an ECG is performed at the onset of symptoms to facilitate the diagnosis and identification of the disease. For example, if a patient experiences chest pain, chest tightness, or shortness of breath, it is recommended that an ECG be performed as soon as possible. An asymptomatic ECG can also be saved and compared with the ECG at the onset of symptoms, which can help to determine whether there are arrhythmias, myocardial ischemia, and other cardiac pathologies that may be present.