normal
mild
moderate
moderately severe
severe
very severe
Through an analysis applied to some of the indices and parameters calculated in the FVC test, Smart One® produces a variety of
quality control comments useful to understand the reliability of the test made.
This control quality check assigns a letter for the current session as described below:
PRE Test
A = At least two acceptable manoeuvres, with the highest two FEV1 values matching to within 100 mL and the largest two FEV6
values within 100 mL.
B= At least two acceptable manoeuvres, with the FEV1 values matching to within 101 to 150 mL
C= At least two acceptable manoeuvres, with FEV1 values matching to within 151 to 200 mL
D= only one acceptable manoeuvres, or more than one, but the FEV1 values not matching to within 200 mL (with no
interpretation).
F= No acceptable manoeuvres (with no interpretation).
POST Test
A = two acceptable (1) FEV1 values matching within 100 mL
B= two acceptable (1) FEV1 values matching within 200 mL
C= two acceptable (1) FEV1 values that do not match within 200 mL
D= only one acceptable (1) FEV1 manoeuvre
F= No acceptable (1) FEV1 manoeuvres
Acceptable manoeuvre means: good start and satisfactory exhalation (duration and flow)
Where several comments related to the single test are calculated, Smart One® will only show the most important to facilitate the test
interpretation.
ERROR IN Vext and PEF
If the extrapolated volume Vext is greater than 500 mL or greater than 5% of the FVC, or if the PEFT (time to peak flow) is
greater than 300 ms, then the following comment is shown:
INITIAL EXPIRATION TOO SLOW
FET error
If FET is under the predicted threshold the following message appears:
EXPIRY TIME INSUFFICENT <6s
FLOW ERROR
If the last flow point of the F/V curve is greater than 200 mL/s, this indicates that the expiration was not complete and thus the
following comment is shown:
BLOW OUT ALL AIR IN LUNGS
Between two tests, Smart One® evaluates the repeatability of the following parameters:
PEF repeatable when the difference between the two largest PEF is ≤ 0.67 L/s;
VC repeatable when the difference between the two largest VC is ≤ 150 mL;
If FVC is > 1.0 L then:
FEV1 repeatable when the difference between the two largest FEV1 is ≤ 150 mL;
FVC repeatable when the difference between the two largest FVC is ≤ 150 mL;
if FVC is ≤ 1.0 L then:
FEV1 repeatable when the difference between the two largest FEV1 is ≤ 100 mL;
FVC repeatable when the difference between the two largest FVC is ≤ 100 mL;
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