Welch Allyn CP 150 spirometry option - User Manual - Manual (Page 60)

About quality feedback
The spirometer provides two kinds of quality feedback: effort-quality messages and test
quality grades, as described in the following sections.
About effort-quality messages
One of the following effort-quality messages appears on the screen after each effort is
completed. These messages indicate whether an effort was acceptable and
reproducible, and if not, what the patient needs to do differently.
The term “match” here means “variation” or “difference with respect to best test.”
Effort-quality message Criteria
Don’t hesitate Back-extrapolated volume > 150 ml or 5%, whichever is greater.
Blast out faster PEF time > 120 ms.
Blow out longer FET < 6.0 seconds, and end-of-test volume > 100 ml (invalid FEV6).
Blast out harder PEF is not reproducible (match > 1.0 L/s).
Deeper breath FEV6 match > 150 ml FVC may be substituted for FEV6.
Good effort Effort meets above criteria.
Good test session Two acceptable efforts match.
About test-quality grades
Another type of feedback is the test-quality grade, as described in the following table. If
Quality grades is enabled in the FVC report settings, a grade appears on printed reports
and also displays on screen when you view the values or interpretation of a completed
test.
To enable or disable this setting, see Viewing or changing the spirometry settings.
Test-
quality
grade
Number of acceptable efforts Reproducibility
A 2 or more Largest two FEV1 values match ≤ 100 mL.
Largest two FVC values match ≤ 100 mL.
B 2 or more Largest two FEV1 values match > 100 and ≤ 150 mL.
C 2 or more Largest two FEV1 values match > 150 and ≤ 200 mL.
D 1 or more Largest two FEV1 values match > 200 mL.
F None
56 Predictive Norms, etc. CP 150 spirometry option