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, which measures airflow, and diffusion capacity tests, which assess how well oxygen passes from the lungs to the blood. These tests are often used to diagnose conditions like asthma, chronic obstructive pulmonary disease (COPD), and other respiratory issues. They help doctors determine the severity of lung problems and guide treatment options. Regular testing can also monitor lung health over time.