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What are the four stages of COPD?

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They are

1. Mild COPD: This stage has an FEV1 of about 80% or above normal.

2. Moderate COPD: It has an FEV1 ranging from 50-80% of normal

3. Severe COPD- It is characterized by severe emphysema and has an FEV1 ranging from 30-50% of normal.

4. Severe COPD; It is very critical and the last stage. FEV1, lower than stage 3, characterize it.