A Pulmonary Function Test (PFT) is a set of diagnostic procedures used to assess lung function and measure the ability to inhale, exhale, and transport oxygen. It helps in diagnosing and monitoring respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis. During a PFT, patients are asked to breathe into a machine that measures lung volume, airflow, and gas exchange efficiency. The results provide valuable information about the health of the lungs and guide doctors in developing effective treatment plans to manage respiratory conditions.