Medically reviewed by Susan Russell, MD Key Takeaways Obstructive lung diseases like COPD cause trouble when you're exhaling air.Restrictive lung diseases like pulmonary fibrosis make it harder to ...
What are pulmonary function tests? Pulmonary function tests (PFTs) are tests of lung function. They are intended to evaluate and monitor chronic obstructive pulmonary disease (COPD). COPD is ...