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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.
Although spirometry is very useful for helping to diagnose some conditions and monitor their treatment, a normal spirometry test does not necessarily rule out some forms of lung disease as there can be periods when spirometry tests can be normal even where a lung condition exists, such as asthma. Note: the information below is a general guide only.