Diagnosis of asthma typically involves a combination of clinical assessment, pulmonary function testing, and response to bronchodilators. Spirometry is the most common diagnostic tool, measuring the forced expiratory volume (FEV1) and forced vital capacity (FVC). A significant improvement in FEV1 after administration of a bronchodilator indicates reversible airway obstruction, a hallmark of asthma (Global Initiative for Asthma, 2023).