Stage
Spirometry
GOLD 1: Mild
FEV1
3
80% predicted
GOLD 2: Moderate
50% £ FEV1<80% predicted
GOLD 3: Severe
30% £ FEV1<50% predicted
GOLD 4: Very Severe
FEV1<30% predicted
Table 2:
COPD Staging [2].
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