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Pulmonary Function Tests (PFTs) are a broad range of tests used to measure how well your lungs inhale and exhale air. They help determine the presence of lung abnormalities, progression of lung disease, and a course of therapy and treatment. Pulmonary function testing includes simple spirometry, complete spirometry testing, pre- and post-bronchodilator studies, lung volumes, diffusion studies, airway resistance, and airway compliance.