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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 (measuring the lung capacity) is the most important test to diagnose and monitor COPD. COPD causes narrowing of the bronchial tubes (or airways), resulting in shortness of breath. The greater the narrowing, the more difficult breathing becomes. Spirometry is a test which measures exactly how much the bronchial tubes have narrowed. The spirometer measures the speed your lungs can be filled and emptied of air, giving an indication of how well your lungs are performing.