Lung function tests are medical assessments that measure how well your lungs are working. These tests evaluate various aspects of lung performance, including the amount of air you can inhale and exhale, as well as how efficiently oxygen moves into your bloodstream. Common tests include spirometry, lung volume measurement, and diffusion capacity tests. These tests are often used to diagnose conditions like asthma, chronic obstructive pulmonary disease (COPD), and other respiratory issues. By understanding lung function, healthcare providers can develop appropriate treatment plans and monitor the effectiveness of therapies over time.