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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.
The spirometry test is performed using a device called a spirometer, which comes in several different varieties. Most spirometers display the following graphs, called spirograms: 1  a volume-time curve, showing volume (litres) along the Y-axis and time (seconds) along the X-axis.verage values for forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1) and forced expiratory flow 25â75% (FEF25â75%), according to a study in the United States 2007 of 3,600 subjects aged 4â80 years.