Vitalograph copd-6 - Page 8

or fatigue during the test procedure, stop testing until
recovered.
3.3. Setting the Obstructive Index and COPD Classication
Zones
The device’s Obstructive Index and COPD Classication zones
are set to the GOLD (Global Initiative for Chronic Obstructive Lung
Disease) standard. It is unlikely that a user will need to change this,
however if change is required the instructions are outlined below.
The colour systems for each zone type are pre-set as follows:
FEV1%
Pred.
Obstructive
Index

COPD
Classication
FEV1/FEV6
Ratio and
FEV% Pred.
≥ 80% 0 (Green)
 Not COPD
FEV1/FEV6
> 0.7
Top
Boundary
Stage I
FEV1/FEV6
< 0.70and
FEV1 ≥ 80%
Pred.
< 80% 1 (Yellow)
Middle
Boundary
Stage II
FEV1/FEV6
< 0.70and
FEV1 < 80%
Pred.
< 50% 2 (Orange)
Bottom
Boundary
Stage III
FEV1/FEV6
< 0.70and
FEV1 < 50%
Pred.
< 30% 3 (Red)  Stage IV
FEV1/FEV6
< 0.70and
FEV1 < 30%
Pred.
To set the boundary percentage values for both the Obstructive
Index and COPD Classication zones together: