What is the difference between a stress test and an EKG?

An EKG is usually the first and more simple test given to test a patient's heart, potentially followed by a stress test.

An electrocardiogram (EKG) is a test to look at the electrical activity of the heart. A stress test is a test in which the heart is put under stress, either through exercise or with the use of medicine. During the stress test an EKG is taken at various times to look for changes in the heart while under stress.

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