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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.
Spirometry. 1  Spirometry is a very common test to help you and your doctor understand your asthma better, and check how it is improving with treatment. 2  Your doctor may order a bronchodilator to be given as part of spirometry. 3  The doctor may also order tests that measure your lung volumes.