What are Pulmonary Function Tests?
Pulmonary Function Tests, as the title implies, are a series of tests that give picture of the functional capabilities of the lungs.  

Most common and widely known test is Spirometry, which is a basic examination for the diagnosis and follow up of a number of respiratory diseases.  

The following most common tests are Lung Volumes and Capacities measurement and Diffusion Capacity measurement.

More information can be found in the files below, by the American Thoracic Society (ATS).

pulmonary-function-tests ATS.pdf