Service manual

IQmark Digital Spirometer Operation Manual
21
The third area on this tab, FVC Settings, enables you to define the acceptable length of
test required. Reducing this number will affect the length of test acceptability error code.
The ATS recommends that the minimum length of test be set to 6 seconds.
Primary Care Practitioner (PCP) Mode
The PCP Mode automatically selects the NHANES III reference equations and
interpretation logic. It also modifies the test acquisition screen, the test review screen and
the printed reports. To set the Spirometer into the PCP Mode, the user selects PCP
Mode from the pull-down list in the Configuration Profile box and clicks OK.
As recommended by the National Lung Health Education Program (NLHEP), this mode
simplifies the test procedure, measurements displayed and report options. For the test
procedure, it eliminates the inhalation side of the flow volume loop and stops the test at 6
seconds of exhalation. It also eliminates the VC and MVV test selection.
For the measurements and reports, it only displays values for FEV1, FEV6 and
FEV1/FEV6 and limits the number of digits displayed to two (FEV1 and FEV6 is
displayed as X.X Liters and FEV1/FEV6 is displayed as YY %). Any measured values
that fall below the Lower Limit of Normal (LLN) will be displayed in red (bold in black
and white).
After each test maneuver is performed, the software will grade the test session. The
quality control grade displayed will be A, B, C, D, or F. A test session must be graded A,
B, or C to generate an interpretation and the results of Pre-FVC and Post-FVC tests are
only compared if both the Pre and Post sessions are graded A, B, or C. To have the
software display “Good Test Session”, you must acquire two acceptable tests that match
according to the criteria listed here.
QC Grade Criteria
A At least two acceptable maneuvers with the largest FEV1 values matching
within 100 ml and the largest two FEV6 values matching within 100 ml.
B At least two acceptable maneuvers with FEV1 measurements that match
between 101 and 150 ml.
C At least two acceptable maneuvers with FEV1 measurements that match
between 151 and 200 ml.
D Only one acceptable maneuver or more than one acceptable maneuver,
but the FEV1 values don’t match within 200 ml.
F No acceptable maneuvers
If the FVC maneuver is less than 6 seconds (because the operator ended the test) but the
end of test volume is less than 100 ml during the last 0.5 seconds, then the software will
set the FEV6 value equal to the FVC value (if the FVC measurement is valid).
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