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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.
In diagnosing and treating obstructive lung diseases such as chronic obstructive pulmonary disease (COPD), doctors often use various tests to determine the severity of disease. One of these is a test called a spirometry, in which various measurements of lung function can be calculated.