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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.
This is a more thorough test of lung function. It is used to confirm an asthma diagnosis and help assess severity. During spirometry, you exhale into a device that analyzes the amount and volume of airflow. One part of the test may be repeated after you are given a bronchodilator.