<prompt> As per GOLD criteria, COPD is termed very severe when FEV1 is80 predicted50 but 8030 but 5030 predicted  <response>: GOLD Criteria for Severity of Airflow Obstruction in COPDGOLD stageSeveritySpirometryIMildFEV1FVC 0.7 and FEV1 80 predictedIIModerateFEV1FVC 0.7 and FEV1 50 but 80predictedIIISevereFEV1FVC 0.7 and FEV1 30 but 50predictedIVVery severeFEV1FVC 0.7 and FEV1 30 predictedRef: Harrison 19e pg: 1704 