This test uses spirometry and a type of drug called a bronchodilator. You are given the drug to relax your breathing muscles so that you can breathe more easily.
Spirometry is performed with a machine to record how much air you can blow out per second and in total. You’ll be asked to breathe in deeply and then blow out as hard as you can into a tube. The tube connects to the machine’s computer.
You may need this test to learn your maximum lung function. In some cases, this test may be done to help your health care provider give you a more accurate prognosis or craft your treatment plan.
It’s important to follow instructions exactly when preparing for and during the test. For example, an accurate reading is tied closely to the timing of the drug dose and the spirometry. This will help your health care team get the most accurate information about how the medicine affects your breathing and how your lungs are working.