What is Spirometry?

Spirometry, as an objective measure of how an individual inhales and exhales air as a function of time is the gold standard for diagnosis, assessing and monitoring COPD. The Forced Expiratory Volume in the first second of maximal expiration after a miximal inspiration (FEV1) is used to assess the severity of COPD and is a marker of disease progression.

Figure 1 shows the difference in spirometry results between a person with normal lungs and one with COPD.