Introduction
Pulmonary function Test (PFTs) are noninvasive tests that shows how well the lung are working. PFT measures lung volume, capacity, rates of flow, and gas exchange. This procedure helps to decide the treatment of certain lung disorders. A spirometry is a device with a mouth piece hooked up to small electronic machine which can help diagnose Chronic bronchitis, Asthma, Respiratory infections, Lung fibrosis, COPD, Bronchiectasis, Weakness of the chest wall muscles and so on.