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Spirometry with bronchodilator reversibility is a specialized Pulmonary Function Test (PFT) used to assess how well the lungs are functioning and to diagnose obstructive airway conditions like asthma and Chronic Obstructive Pulmonary Disease (COPD). During the test, a patient breathes into a spirometer to measure airflow and lung volumes. After the initial measurement, a bronchodilator medication is administered, and the test is repeated to observe whether lung function improves.

This "reversibility test" helps differentiate between asthma (which usually shows significant improvement after bronchodilator use) and COPD (which shows minimal or no improvement). It provides valuable information about airflow obstruction, lung capacity, and treatment response. This test is non-invasive, safe, and essential for guiding accurate diagnosis, treatment planning, and monitoring of chronic respiratory diseases.