5th January 2024

Classifying the severity of airflow obstruction

Post-broncho-dilator FEV1/FVC	FEV1 % predicted	NICE guideline CG101 (2010) severity of airflow obstruction (post-broncho-dilator)
<0.7	>= 80%	Stage 1 -Mild
<0.7	50-79%	Stage 2- Moderate
<0.7	30-49%	Stage 3- Severe
<0.7	<30%	Stage 4 – Very Severe

NICE. Recommendations | Chronic obstructive pulmonary disease in over 16s: diagnosis and management | Guidance | NICE [Internet]. Nice.org.uk. NICE; 2018. Available from: https://www.nice.org.uk/guidance/ng115/chapter/Recommendations#diagnosing-copd

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