Table 1. Severity of airflow obstruction |
|||
|
NICE clinical guideline 12 (2004) |
NICE clinical guideline 101 (2010) |
|
Post-bronchodilator FEV1/FVC |
FEV1 % predicted |
|
Post-bronchodilator |
< 0.7 |
≥ 80% |
|
Stage 1 – Mild* |
< 0.7 |
50-79% |
Mild |
Stage 2 – Moderate |
< 0.7 |
30-49% |
Moderate |
Stage 3 – Severe |
< 0.7 |
< 30% |
Severe |
Stage 4 – Very severe |
*Symptoms should be present to diagnose COPD in people with mild airflow obstruction |
Severity |
FEV1 % of Predicted |
Read Code |
Mild |
FEV1 ≥ 80% |
H36 |
Moderate |
FEV1 50-79% |
H37 |
Severe |
FEV1 30-49% |
H38 |
Very Severe |
FEV1 < 30% |
H39 |