EasyOne Pro™ / EasyOne Pro™ LAB 93
Quality Messages and Quality Grades
5.4 FRC Quality Messages
Message Criterion Recommended action
FRC(MBW) Warning:
Extrapolated volume
computation failed
(set to zero)!
The extrapolated volume could
not be calculated.
Contact service.
FRC(MBW) Warning:
Extrapolated volume
computation too
high (set to zero)!
The extrapolated volume (i.e., the
volume that would be washed out
after cancellation of the test) is
greater than 1 liter.
Do not stop too soon.
FRC(MBW) Warning:
Inspiratory leak!
Air entered from outside during
inspiration.
The end-inspiratory molar mass
deviates from the tracer gas molar
mass by more than 0.2 g/mol.
This is indicative of air drawn in
from outside during inspiration.
Check FRC barriette™: are valves
jammed or was the FRC barri-
ette™ not been properly inserted?
Check position of spirette™ and
of nose clip.
Ask patient to breathe calmly.
FRC(MBW) Warning:
In- or expiratory pres-
sure too high!
Pressure in sensor tube is too
high.
The pressure in the sensor tube
exceeds ±5 mbar; possible rea-
sons are:
1) Insufficient pressure at the O2
gas port.
2) Patient's breaths are too deep;
the respiratory resistance and
thus the pressure drop increase
from about 2 l/s.
Check O2 gas supply: Is the inlet
pressure 3 bar? Only minimal
pressure variations are allowed
during the test.
Is the patient's breathing too
deep/too fast?
Ask the patient to breathe within
the limits of ±1.5 l/s.
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