What are Pulmonary Function Tests (PFTs)?
Pulmonary function tests (PFTs) tell us how well you breathe. They measure how much air you can breathe in and out, how well your breathing muscles work to move your lungs (like a pump), and how well your lungs exchange gas (move air from the small air sacs in the lungs to the bloodstream). Your doctor uses these tests to screen you for health problems, keep a watch on your condition, and prescribe therapy. A single test or series of tests over time may be done. Why are PFTs done? You may have PFTs for many reasons, for example, as a precaution before surgery, to check the status of your lung disease or neurological problems, or as part of your role in research. PFTs also help your doctor know how your medications are working and can help him or her prescribe your medications. Preparation There is no preparation for PFTs, but it is best that you be relaxed. Wear loose-fitting clothing and avoid belts or girdles that may make it harder for you to breathe. Some patients who take breathin
