What kind of lung function tests are there and what do they involve?
Lung function tests (also called pulmonary function tests, or PFTs) measure how well your lungs work. Most of the tests involve measuring how much air you can breathe in (inhale) and breathe out (exhale). For instance, if you exhale much less than the normal volume of air in one second or still have too much air in your lungs after exhaling forcefully, it may be a sign of lung disease. Lung function tests can also help to follow the course of a lung condition. As well as measurements of your ability to breathe in and out effectively, the oxygen content of your blood can be measured to see how well your lungs are working.