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Table 1 Classification of airflow obstruction severity according to GOLD

From: Prediction of gold stage in patients hospitalized with COPD exacerbations using blood neutrophils and demographic parameters as risk factors

In patients with FEV1/FVC < 0.70
GOLD 1 Mild FEV1%pred ≥ 80
GOLD 2 Moderate 50 ≤ FEV1%pred < 80
GOLD 3 Severe 30 ≤ FEV1%pred < 50
GOLD 4 Very severe FEV1%pred < 30