Lung Function Testing is a group of tests that measure how well your lungs are working. These tests assess the amount of air you can inhale and exhale, as well as how quickly you can do so. Common tests include spirometry, which measures airflow, and plethysmography, which evaluates lung volume. These tests help doctors diagnose conditions like asthma, chronic obstructive pulmonary disease (COPD), and other respiratory issues. By understanding lung function, healthcare providers can create effective treatment plans and monitor the progress of lung diseases over time.