Pulmonary Function Tests (PFT) are non-invasive tests that measure how well your lungs are working. They assess lung capacity, airflow, and the efficiency of gas exchange, helping doctors diagnose and monitor respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), or lung fibrosis. Patients should opt for PFT if they experience shortness of breath, chronic cough, or are managing a lung condition. The test also helps monitor lung function pre- and post-surgery or treatment.