Pulmonary Function Tests (PFTs) measure the size of your lungs, how well air moves in and out of your lungs, and how well your lungs bring oxygen into your body.
These tests help your medical provider determine the type and severity of lung disease present. They are also used to monitor for response to therapy and disease progression. PFTs are usually performed in a hospital or clinical laboratory and consist of breathing through a “spirometer.”
One of the main measurements relevant to Pulmonary Fibrosis patients is Forced Vital Capacity, or FVC, which is the amount of air which can be forcibly exhaled from the lungs after taking the deepest breath possible.