B-16 CASE Revision C
2060290-201
Miscellaneous: Spirometry Reference Value Equations, Interpretation Modes, Measurements
Interpretation Modes
Note
The authors of the reference values developed the interpretation
modes for the reference value equations. Other reference value
equations may lead to different interpretations.
Europe
An interpretation mode on the basis of the ECCS reference values. The
flow-volume loop is analyzed according to these criteria:
1. Expiratory flow limitation?
2. Curve typical of restriction?
3. Expiratory stenoses?
4. Impaired peripheral respiration?
Expiratory flow limitation
* If all four interpretation criteria are normal, the interpretative
statement Normal lung function values is displayed.
Possible causes increased airway resistance (e.g. asthma), reduced
pulmonary elasticity (e.g. emphysema), airway obstruction
Criterion MEF50 % VC Ref.
Definition Interpretative Statement
> 70 % normal*
50 ... 70 % mild expiratory flow limitation
35 ... 49 % moderate expiratory flow limitation
< 35 % severe expiratory flow limitation
if < 70 % further lung function measurement recommended
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