Bedfont GastroCH4ECK Gastrolyzer User Manual page 11

A beep will sound during the last three seconds of the
countdown.
Exhale slowly into mouthpiece when prompted onscreen.
An on-screen dial will help to guide the exhalation rate; keep
the arrow pointing in the green section of this indicator
throughout the test.
The arrow will change colour as the O level in the breath
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sample reduces to the target 15%, at which point it will turn
green and the test will automatically stop after 3 seconds.
NOTE: If the patient is unable to exhale for any longer, the
test can be ended early by pressing END.
The results will be shown onscreen.
Once the test is complete, the final O concentration can be
2
observed by pressing the question mark.
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