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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 is a lung capacity test that also measures how quickly you can exhale. Doctors use it to test for a variety of conditions, including asthma, chronic obstructive pulmonary disease and emphysema. However, it also offers a general measure of cardiorespiratory fitness. During the test, a doctor or nurse clips your nose shut and then uses a machine to measure your breathing as you inhale and exhale. You will have to inhale deeply and slowly and then exhale as forcefully as you can several times.