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Turn the spirometer on,
choosing a chart speed of 20 mm/second, and move the
piston so the pen is at the center of the chart paper.
The subject should put on
the noseclip and place the mouthpiece attached to the hose in the mouth.
Press the handswitch to
start recording. After recording a few normal breaths, the subject
should be instructed to inhale maximally then exhale
forcefully and quickly,
without holding lung volume at the maximal inspiratory level. The
subject should then return to normal breathing for a few breaths. Press
the handswitch to stop recording. This is the Forced Vital
Capacity Manoeuvre. |
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