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Gold criteria for very severe airflow obstruction in COPD is
FEV1/FVC<0.7 & FEV1>=80% predicted
FEV1/FVC<0.7 & >=50% FEV1 but <80% predicted
FEV1/FVC<0.7 & FEV1>=30% but <50% predicted
FEV1/FVC<0.7 and FEV1<30% predicted
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