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39
Chapter 2: Astra 300 Functional Operation
The Spirometry Source
At the end of the maneuver, one or more of the QC
Warnings (if enabled in the Customization Program) may
appear, alerting the technician as to whether the
maneuver is in compliance with ATS or NLHEP Quality
Control criteria.
Depending on the indication, if the maneuver has not
been carried out according to one of the following ATS
criteria:
ET - Indicates that the blow has not completed
satisfactorily, as the variation on volume in the last second
of the maneuver was more than 25 ml, or the maneuver
has lasted less than 6 seconds (in patients over 10 years
of age) or less than 3 seconds (in patients 10 years of
age or less).
EX - Indicates that the start of expiration was not
satisfactory, as the extrapolated volume is above 5% of
the FVC or 0.15 liters. The ATS/ERS recommends that
the extrapolated volume be less than 5% of the FVC or
0.15 liters, whichever is highest.
The technician doing the testing may, where
considered appropriate, disable these warnings in
the Customization Program. In this case, they will
also be removed from the printed report.
This disabling is only at display level. The warnings
are still taken into account when classifying the order
of the maneuvers.
ATTENTION: Check in the Customization Program that
the Predicteds
and the ETHNIC FACTOR are
suitably selected. The ethnic factor modifies the
value of the References according to the percentage
selected. 100% is equivalent to the unmodified
standard value of the References.