An electrocardiogram (EKG) test is a simple, painless procedure that measures electrical signals in your heart. An electrocardiogram (EKG) measures your heart's electrical activity. Your doctor may suggest you get an electrocardiogram -- also called an EKG or ECG -- to check for signs of heart disease. The American Heart Association explains an electrocardiogram (EKG or ECG) is a test that measures the electrical activity of the heartbeat. An electrocardiogram records the electrical signals in your heart. Read about the electrocardiogram (ECG, EKG) procedure used to reflect.