Pulmonary Function Testing is used to assess lung mechanics and gas exchange efficiency and to classify respiratory impairment and help guide therapy options.
In a Pulmonary Function Test (PFT), also called a Spirometry Test, you breathe into a mouthpiece that is connected to an instrument called a spirometer. It records the amount and the rate of air that you breathe in and out over a period of time.
Some PFTs allow you to breathe normally and quietly; others require forced inhalation or exhalation after a deep breath. Some patients experience a short period of light-headedness or shortness of breath.