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Lung function testing.

A spirometer can be used to determine how well the lungs receive, hold, and utilise air. They are also used to monitor and determine the severity of a lung disease and to determine whether the lung disease is restrictive (decreased airflow) or obstructive (disruption of airflow). After taking a deep breath, a person forcefully breathes out into the spirometer as completely and forcefully as possible. The spirometer measures both the amount of air expelled and how quickly the air was expelled from the lungs. The measurements are then recorded by the spirometer. Spirometry readings usually show one of four patterns: