In Which Stage Of Copd Is The Forced Expiratory Volume (Fev) Less Than 30%?

(Correct Answer Below)

In Which Stage Of Copd Is The Forced Expiratory Volume (Fev) Less Than 30%?

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III- Stage III patients demonstrate an FEV less than 30% with respiratory failure or clinical signs of right heart failure. Stage II patients demonstrate an FEV of 30% to 80%. Stage I is mild COPD with an FEV less than 70%. Stage 0 is characterized by normal spirometry.

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