A series of tests known as pulmonary function tests are used to gauge one's ability to breathe and how well their lungs are working. Airflow is measured by spirometry. Spirometry can assess a wide variety of lung diseases by measuring the quantity and rate of air you exhale. During a spirometry test, you sit and breathe into a mouthpiece attached to a device known as a spirometer. The spirometer keeps track of the volume and rate of air you breathe in and out over time. Some numbers may differ slightly when standing. You can breathe normally and quietly during some of the test measurements. Other tests demand a forced breath in or a forced breath out. On occasion, you might be asked to breathe in a different gas or a medicine to see if the results of the test change.
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