Vitalograph copd-6 - Page 7

Normal
Stage I
Stage II
Stage III
Stage IV
0 1 2 3
FEV₁/FEV₆ Ratio and
FEV₁ % Predicted
-
FEV₁/FEV₆ ≥ 0.7
-
FEV₁/FEV₆ < 0.70 & FEV₁ ≥ 80 % Pred.
-
FEV₁/FEV₆ < 0.70 & FEV₁ < 80 % Pred.
-
FEV₁/FEV₆ < 0.70 & FEV₁ < 50 % Pred.
-
FEV₁/FEV₆ < 0.70 & FEV₁ < 30 % Pred.
FEV₁%
Predicted
≥80% <80% <50% <30%
Obstruction
Index
COPD
Classification