ABSTRACT
Pulmonary Function Tests (PFTs) are important in the assessment of patients presenting with respiratory complaints. PFTs are readily available and noninvasive tests that aid in the diagnosis of pulmonary conditions. These tests can be used to guide decisions regarding changes to therapy. Peak flow measurement is a quick, inexpensive way to measure the maximal flow rate achieved during forced expiration following a full inspiration. Impulse oscillometry measures the resistance and reactance of the airways to small pressure oscillations which are applied at the mouth and transmitted to the lungs. Other ways to measure pulmonary function are spirometry and plethysmography which provide more information about lung volumes and capacities. Pulmonary function testing helps to differentiate between obstructive and restrictive lung disease. Obstructive lung disease is characterized by obstruction or narrowing of the airways. Pulmonary function testing measures Tidal Volume, Vital Capacity, Inspiratory Capacity, Functional Residual Capacity, and so on.
