What is a pulmonary function test?

Pulmonary function: Pulmonary function testing generally requires a person to sit in a booth and breathe through a mouthpiece. A machine analyzes the flow and volume of air moving trough the lungs. The procedure is benign and not painful.

PFT's: are tests that look at your lung function. They are used to tell if you have obstructive disease by looking at how much air you can blow out; they can tell if you have a restrictive disease by looking at your lung volumes; and they can tell how well you are able to exchange oxygen between your alveoli (air sacs) and capillaries by doing a diffusion test.