What are the 4 stages of COPD?
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Stage 1 COPD is considered mild. At this stage, you may not be aware that you have lung function problems. Your doctor will classify you as stage 1 if your FEV1 is between 80% and 100% of predicted.
COPD is considered stage 2 when your FEV1 drops to 50% to 79% of predicted.
At stage 3, COPD is considered severe, and your forced expiratory volume is between 30% and 50% of predicted. You may have difficulty catching your breath during household chores and be unable to leave the house.
Stage 4 is considered very severe. Your forced expiratory volume is less than 30% of normal, and your blood oxygen levels are also low. You are at risk of developing COPD complications, such as heart or lung failure.
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