(PFTs, Pulmonary Function Studies, Lung Function Studies/Tests,
Airflow Assessment) What are pulmonary function tests? Pulmonary
function tests (PFTs) are noninvasive diagnostic tests that
provide measurable feedback about the function of the lungs. By
assessing lung volumes, capacities, rates of flow, and gas
exchange, PFTs provide information that, when evaluated by your
physician, can help diagnosis certain lung disorders. A
normally-functioning pulmonary system operates on many different
levels to ensure adequate balance. One of the primary functions
of the pulmonary system is ventilation, the movement of air into
and out of the lungs. Some medical conditions may interfere with
ventilation. These conditions may lead to chronic lung disease.
Conditions that interfere with normal ventilation are
categorized as restrictive or obstructive. An obstructive
condition occurs when air has difficulty flowing into the lungs
due to resistance, causing a decreased flow of air. A
restrictive condition occurs when the c