Puritan Bennett Renaissance II User Manual page 51

Interpretation of the Results
Table 8: Interpretation Results
*Physiological variant is interpreted as "Undetermined" in the Renaissance II if FVC and FEV1 are
greater than 100% and FEV1% is less than 100%.
If the FEV1/FVC ratio (FEV1%) is below the lower limit of the normal range,
the patient is identified as having airway obstruction. The degree of
obstruction is then determined by the amount of reduction in the FEV1 value.
If the FVC is also reduced in a patient with an obstruction, a superimposed
restriction cannot be ruled out.
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