6 MWT = 6-min walk test; PFT = pulmonary function test; POD = perception of dyspnea. See Table 3 for abbreviations not used in the text. *OP = outpatient; ADL = activities of daily living ...

A low FEV1 suggests a breathing obstruction. FEV1 is measured during a spirometry test, also known as a pulmonary function test, which involves forcefully breathing out into a mouthpiece connected ...

Find out what happens during a chest X-ray. Pulmonary function tests: Doctors can use breathing tests to diagnose COPD. Get more information on the different types of lung function tests.