Vitalograph copd-6 BT - 3.3. Setting the Obstructive Index and COPD Classification Zones

abrupt end (change in volume is > 25ml in the last second
of the test), the value FEV will be displayed instead of
FEV6.
3. If the subject experiences side effects such as dizziness
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.
