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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.
If you have a very young child, spirometry is not practical. So the diagnosis is made based on your report of symptoms. Lung function tests. In an older child, lung function tests can diagnose asthma, determine its severity, and check for complications. Spirometry is the most common test to diagnose asthma in older children. It measures how quickly a child can move air in and out of the lungs and how much air is moved. Testing of daytime changes in peak expiratory flow (PEF) is done over 1 to 2 weeks.