Spirometry is the measurement of an individual’s ability to inhale and exhale. A spirometry test is a simple and short examination. During the test, a patient inhales and exhales through a mouthpiece into a device called a spirometer, which records the patient’s breathing capabilities.

The spirometry test is one of three pulmonary function tests. The spirometer is used to assess different values involving respiration. These include:

• Speed at which an individual can exhale
• Amount of air the lungs can hold (lung capacity)

A physician can use the data obtained during the test to evaluate the patient’s breathing ability and diagnose certain conditions (e.g., asthma, lung disease). The test can also gauge the progression of respiratory diseases and help determine effective forms of treatment. Spirometry is a useful diagnostic tool for patients 5 years of age and older.