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Spirometry is the most common of the lung function tests. These tests look at how well your lungs work. Spirometry shows how well you breathe in and out. Breathing in and out can be affected by lung diseases such as chronic obstructive pulmonary disease (COPD), asthma, pulmonary fibrosis and cystic fibrosis.
The best tests for diagnosing COPD and seeing how well it responds to treatment are pulmonary function tests. The gold-standard test for patients with respiratory symptoms is spirometry. Spirometry measures the volume and force of air as it is exhaled from the lungs. It measures airway obstruction, can identify COPD early, and the results are standardized so they are always consistent.