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Lung oscillometry is a non-invasive pulmonary function test that measures the resistance and reactance of the airways during normal, quiet breathing. Unlike traditional spirometry, it does not require forceful exhalation, making it especially useful for children, elderly patients, or those who are unable to perform spirometry correctly. The test works by sending small pressure waves into the lungs through a mouthpiece, which helps assess airway stiffness and obstruction, particularly in the small airways that may not be detected by standard spirometry. Lung oscillometry is valuable in the early detection and monitoring of conditions such as asthma, COPD, and interstitial lung diseases. It is quick, effort-independent, and highly sensitive to subtle changes in lung function, making it an effective tool for routine respiratory assessments.