Welch Allyn PneumoCheck Operating Instructions Manual page 23

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