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Definition of Pulmonary function test
Medically reviewed by Min Clinic Staff | Updated: January 2026
Pulmonary function test: A test that is designed to measure how well the lungs are working. Abbreviated PFT. PFTs gauge how the lungs are expanding and contracting (when a person inhales and exhales) and measure the efficiency of the exchange of oxygen and carbon dioxide between the blood and the air within the lungs.