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# Severity of Pulmonary Impairment Based on Percentage of Predicted Normal Values This table shows the severity of pulmonary impairment based on the percentage of predicted normal values for obstruction based on FEV1 and gas exchange based on DLCO. | Degree of Impairment | Obstruction Based on FEV...

# Severity of Pulmonary Impairment Based on Percentage of Predicted Normal Values This table shows the severity of pulmonary impairment based on the percentage of predicted normal values for obstruction based on FEV1 and gas exchange based on DLCO. | Degree of Impairment | Obstruction Based on FEV1 (%) | Gas Exchange Based on DLCO (%) | |---|---|---| | Normal | 80-120 | 80-120 | | Mild | 70-79 | 61-79 | | Moderate | 60-69 | 40-60 | | Moderately severe | 50-59 | | | Severe | 35-49 |