How are lung function tests performed?

Lung function tests provide information about how well your lungs are working and are painless and noninvasive, performed using a machine called a spirometer. By having you breathe into the spirometer, your doctor can measure your lung volume and your ability to move air in and out of your lungs in a certain period of time. Your results are compared with typical findings of a healthy person your age and height. Your doctor can then determine to what extent your lung function is diminished.

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