If you have an old spirometer, with no option to read or upload flow-volume or volume-time curves, please ditch it. Without seeing the graphical traces, you cannot accurately detect spurious or ...

To investigate whether the use of feedback information provided by viewing flow volume (F/V) curves during spirometry performed by practice assistants improves spirometry test quality. Higher PEF ...

An inaccurate spirometer is worse than useless. But having an accurate one is not a matter of belief or faith; it is a matter of proof. Furthermore, this must be documented proof. Without a documented ...