Pulmonary Function Tests (PFTs) are a group of non-invasive tests that measure how well the lungs are functioning. These tests assess lung volume, capacity, rates of flow, and gas exchange to help diagnose and monitor respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other lung disorders. Common types of PFTs include spirometry, which measures how much air a person can inhale and exhale, and the speed of exhalation. The results can provide crucial information about lung health and help guide treatment plans for patients with breathing difficulties or chronic lung diseases.