Spirometry is a physiological test that measures how an individual inhales or exhales volumes of air as a function of time. The primary signal measured in spirometry may be

volume or flow.

Spirometry is invaluable as a screening test of general respiratory health in the same way that blood pressure provides important information about general cardiovascular

health. However, on its own, spirometry does not lead clinicians directly to an aetiological diagnosis.Respiratory Society (ERS) [5]. There are generally only minor

differences between the two most recent ATS and ERS statements, except that the ERS statement includes absolute lung volumes and the ATS does not.

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ATS criteria for spirometry

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