A spirometer is a simple medical device used to measure lung function by determining how much air a person can inhale and exhale. Spirometer testing, also called pulmonary function testing (PFT), is a common, painless test used by doctors to screen for and diagnose lung diseases as well as monitor how well lungs are working over time. The results of spirometer tests can help detect respiratory problems early and determine how severe they may be.

A spirometer consists of a mouthpiece attached to either a mechanical or digital monitor that tracks airflow into and out of the lungs. During testing, the patient forcefully inhales as deeply as possible through the mouthpiece. This air is then fully exhaled as fast as possible. The spirometer measures airflow and displays results of lung volume over time on a screen or printout.

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