Welch Allyn PneumoCheck, Operating Instructions Manual

Page: 23 / 71

INTERPRETATION OF FVC RESULTS
FLOW CHART,
FEV 1 above 80% Y e s
Borderline
of predicted?
Obstruction
NO
Yes
FEV above 60%
of predicted?
Obstruction
No
FEV above 40%
of predicted?
Severe
Obstruction
FVC above 60%
Yes
of predicted?
No
FVC above 50%
Yes
of predicted?
No
FVC below 80%
of predicted?
Yes
And low vital capacity, cannot
superimposed
restriction.