Interpretation Of Results - Welch Allyn PneumoCheck Operating Instructions Manual

INTERPRETATION OF RESULTS

The PneumoCheck Printer/Charger will place a star beside values
which are abnormal, ,,. If the FEVl/FVC ratio is abnormally low, an
obstructive disorder is indicated. Use the FEVl to grade the severity
of the obstruction:
An FEVI above 80% of predicted indicates a
l
Borderline Obstruction.
An FEV1 between 60% and 80% of predicted indicates a
l
Mild Obstruction.
An FEVl between 40% and 60% of predicted indicates a
l
Moderate Obstruction.
An FEVl below 40% of predicted indicates a
l
Severe Obstruction.
If the FEVl is below 80% of predicted and the FVC is also
l
below 80% of predicted, the possibility of a superimposed
Restriction in addition to the Obstruction exists.
If the FEVl/FVC ratio is normal, but the FVC is abnormal, a re-
strictive disorder is indicated, and the FVC is used to grade the
severity of the restriction:
An FVC between 60% of predicted and the lower limit of
l
normal indicates a
An FVC between 50% and 60% of predicted indicates a
l
Moderate Restriction.
An FVC below 50% of predicted indicates a
l
Severe Restriction.
Any patient who has a normal FVC, FEVl/FVC, and FEF 2575% is
considered to be within normal limits, and clinically significant
obstructive lung disease can be ruled out. An exception to this is the
asymptomatic asthmatic who is in remission.
Mild Restriction.
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