The Global Initiative for Chronic Obstructive Lung Disease has classified the severity of COPD into four stages based on post bronchodilator FEV1.0. Stage IV is very severe. At what point is the FEV1.0 considered this stage of disease?

The Global Initiative for Chronic Obstructive Lung Disease has classified the severity of COPD into four stages based on post bronchodilator FEV1.0. Stage IV is very severe. At what point is the FEV1.0 considered this stage of disease?





a. =50%
b. <30%
c. <40 %
d. =80%



Answer: B


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