Most often, a stress test includes an electrocardiogram to measure your heart's electrical activity as you exercise on a treadmill or on a stationary bicycle. Your doctor may also measure your blood oxygen level, blood pressure, and heart rate. During the test, you will exercise for 10 to 15 minutes.

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The test can show the size of the heart's chambers, how well the heart is pumping blood, and whether the heart has any damaged or dead muscle. Nuclear stress tests can also give doctors information about your arteries and whether they might be narrowed or blocked because of coronary artery disease.