Pulmonary Function Tests (PFTs) are a group of non-invasive tests that measure how well the lungs are working. They assess lung volume, capacity, and the flow of air in and out of the lungs. These tests help diagnose conditions like asthma, chronic obstructive pulmonary disease (COPD), and other respiratory disorders. During a PFT, patients may be asked to breathe into a device called a spirometer, which records the amount and speed of air inhaled and exhaled. Results from these tests can guide doctors in determining the best treatment options and monitoring lung health over time.