Exercise tolerance test

The exercise tolerance test evaluates the ability of the heart and lungs to provide oxygen and remove carbon dioxide from the bloodstream before, during, and after exercise.

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How it's done:Before the test, EKG electrodes are placed on your chest to monitor your heart function. Blood pressure will be taken before, during, and after the exercise, typically a workout on a stationary bicycle or a treadmill. A pulse oximeter (device used to determine the amount of oxygen in the blood) is placed on the earlobe or fingertip to monitor blood oxygen levels. If arterial blood gas samples are to be taken during the exercise, a catheter will be placed in an artery in your arm.

How to prepare: Continue to take all of your medicine as you usually do. Also, dress for exercise on the day of the test. Wear tennis (running) type shoes. Avoid wearing sandals, slippers, or high heels. Wear or bring a shirt or blouse that buttons down the front.

The exercise tolerance test often takes three hours.