Electrocardiogram (ECG or EKG) is our basic diagnostic tool that every new patient, or existing heart patients who experience changes in their condition, must have. An EKG can provide a plethora of information that, when combined with review of sign, symptoms and physical examination, might be all certain subsets of individuals need. Nevertheless, It is the healthcare providers’ (MD or NP) expert opinion, discussed with the patient, that would determine if further tests might be needed.