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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 is a test that can help diagnose various lung conditions, most commonly chronic obstructive pulmonary disease (COPD). Spirometry is also used to monitor the severity of some other lung conditions, and their response to treatment. Note: the information below is a general guide only. Mild COPD-FEV1 is 80% or more of the predicted value. 2  This effectively means that someone with mild COPD can have normal spirometry after bronchodilator medication. 3  Moderate COPD-FEV1 is 50-79% of the predicted value after a bronchodilator. 4  Severe COPD-FEV1 is 30-49% of the predicted value after a bronchodilator.