[Table/Fig-1]:

GOLD criterion to diagnose and categorize COPD patients

Gold stage	severity	Spirometry
0	At risk	Normal
1	mild	FEV1/FVC< 0.7 and FEV1<=80% predicted
2	moderate	FEV1/FVC< 0.7 and FEV1 = 50-80 % predicted
3	severe	FEV1/FVC< 0.7 and FEV1=30-50% predicted
4	Very severe	FEV1/FVC< 0.7 and FEV1 < 30% predicted or FEV1< 50% predicted with respiratory failure or signs of right heart failure.