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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.
According to Global Obstructive Lung Disease (GOLD), spirometry, a test that measures the amount of air a person can breathe out and the amount of time it takes to do so, is as important for the diagnosis of COPD as blood pressure measurements are for the diagnosis of hypertension.