8-10 CASE Revision C
2060290-201
Conducting Spirometry Tests
5. Wait for the status line to turn green.
6. Have the patient close the lips around the mouthpiece and perform
the following maneuver through the sensor:
a. Exhale completely.
b. Slowly inhale completely.
c. Exhale as vigorously and for as long as possible (forced
expiratory parameters; in the ATS mode, the expiration should
last 6 seconds (see information on the ATS mode)).
d. Inhale as vigorously and deeply as possible (forced inspiratory
parameters).
7. Click Stop Test (beep). The system also emits the beep when
SpiroSoft terminates the measurement automatically.
8. Repeat the test several times, because the patient's cooperation is
essential for the quality of the test.
9. Click Best test to display the new best test (including system
evaluation) of the tests completed so far.
Note
The flow-volume measurements in the ATS mode must meet specific
criteria:
Acceptability Criteria
The exhalation in the FEV1 maneuver must be longer than
6 seconds (configurable beep, see section “Acquisition Tab” on
page 12-35). Otherwise you will see the message Exhalation too
short.
An expiratory plateau must be achieved, i.e., the expiratory
volume must not vary more than 30 ml within the last second.
Otherwise you will see the message No endexpiratory plateau.
The forced expiration must start as quickly as possible. The
parameter used to determine the correct start is the back-
extrapolated volume. The volume must be less than 150 ml or
less than 5 % of the FVC. Otherwise the message High back-
extrapolated volume will appear.
Reproducibility Criteria
A minimum of three accepted trials is required; two of these must
be reproducible. The reproducibility criterion is a maximum
variation of 200 ml of FEV1 and FVC between the two best tests.
Otherwise you will see the message High FEV1 variability or
High FVC variability.
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