Quality Grades; Best Test Selection - NDD EasyOne Operator's Manual

EasyGuide

10.2 Quality Grades

The quality grades allow you to assess the reliability of the measurement result. Quality grades A to C
indicate a reliable result. A quality grade between D and F indicates inadequate test quality. The result
must then be interpreted with caution.
The quality ratings can be activated or deactivated under Configuration . See also Chapter 8.
The table below defines the criteria for the classification of quality grades:
Rating Criteria in Diagnostic mode
At least 3 acceptable tests (for age < 6: 2 ac-
A
ceptable) AND the difference between the best
two FEV1 and FVC values is equal to or less
than 100ml (80ml if FVC < 1.0 L; for age < 6:
80ml or 8% of FVC whichever is greater)
B At least 3 acceptable tests (for age < 6: 2 ac-
ceptable) AND the difference between the best
two FEV1 and FVC values is equal to or less
than 150ml (100ml if FVC < 1.0 L; for age < 6:
100ml or 10% of FVC whichever is greater)
C At least 2 acceptable tests AND the difference
between the best two FEV1 and FVC values is
equal to or less than 200ml (150ml if FVC < 1.0
L; for age < 6: 150ml or 15% of FVC whichever is
greater)
At least 2 acceptable trials but the results are
D
not reproducible. Quality message "Result not
reproducible" OR only one acceptable trial.
Quality message: Only one acceptable trial
F No acceptable test available
If the Automated Test QC function is activated the instrument determines automatically which trial is
acceptable. For the evaluation of the best trial, the interpretation and the Pre/Post comparison accept-
able trials are used first.
In the Diagnostic mode the Automated Test QC function can be deactivated (see Chapter 8). In this case
each trial can be accepted manually. To do so simply select ACCEPT after the maneuver and the trial will
be considered acceptable.

10.3 Best Test Selection

In the system configuration the best value selection can be set to Best Trial or Best Value . The two
settings are defined as follows:
Best trial: EasyOne
and ERS).
Best value: The Best column shows the largest FVC (or FEV6) and the largest FEV1 from all accepta-
ble tests (unless all tests are unacceptable). All other parameters are taken from the best
trial (again defined by the largest sum of FEV1 and FVC).
selects the trial with the largest sum of FVC and FEV1 (this is suggested by ATS
Criteria in Frontline and NLHEP mode
At least 2 acceptable tests AND the difference
between the two FEV1 and FEV6 values is equal
to or less than 100ml
At least 2 acceptable tests AND the difference
between the two FEV1 and FEV6 values is equal
to or less than 150 ml
At least 2 acceptable tests AND the difference
between the two FEV1 and FEV6 values is equal
to or less than 200 ml
At least 2 acceptable trials but the results are not
reproducible. Quality message "Result not repro-
ducible" OR only one acceptable test. Quality
message "Only one acceptable trial
No acceptable test available
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