Pulmonary function tests (PFTs) are noninvasive tests that show
how well the lungs are working. The tests measure lung volume,
capacity, rates of flow, and gas exchange. This information can
help your healthcare provider diagnose and decide the treatment
of certain lung disorders.
PFTs may be used to check lung function before surgery or other
procedures in patients who have lung or heart problems, who are smokers,
or who have other health conditions. Another use of PFTs is to assess
treatment for asthma, emphysema, and other chronic lung problems. Your
healthcare provider may also have other reasons to advise PFTs.