Pulmonology
BODE Index (COPD)
Prognosis in COPD.
Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.
Background
The BODE index estimates prognosis in stable chronic obstructive pulmonary disease (COPD) by combining four domains: Body-mass index, airflow Obstruction (FEV₁ % predicted), Dyspnoea (mMRC grade) and Exercise capacity (6-minute walk distance). It was developed because mortality in COPD is driven by more than airflow limitation alone, and a multidimensional score predicts outcome better than FEV₁ in isolation. Points are assigned from 0 to 3 for obstruction, dyspnoea and walk distance, and 0 or 1 for BMI, giving a total from 0 to 10. Higher totals indicate worse survival.
Interpreting the result
Survival falls as the score rises: a BODE of 0–2 indicates lower risk and the best survival, 3–4 moderate risk, and 5–10 higher risk with markedly reduced four-year survival. The score captures functional and nutritional status alongside lung function, so two patients with the same FEV₁ can have very different prognoses. It is used to inform prognosis, guide discussions about disease severity and help identify candidates for interventions such as pulmonary rehabilitation or transplant assessment.
Worked example
A patient with a BMI of 20 (1), FEV₁ 40% predicted (2), mMRC dyspnoea grade 3 (2) and a 6-minute walk distance of 200 m (2) scores 1 + 2 + 2 + 2 = 7. This places them in the higher-risk band with significantly reduced predicted survival.
Pearls / pitfalls
- A low BMI scores a point because being underweight is independently associated with worse survival in COPD; obesity does not add points.
- It requires a standardised 6-minute walk test and reliable spirometry, so it cannot be completed from history alone.
- It is intended for stable COPD, not during an acute exacerbation, when measurements are unrepresentative.
- The score informs prognosis and shared decisions; it does not by itself dictate any specific treatment.
Evidence & validation
Derived and validated by Celli and colleagues in COPD cohorts, the BODE index was shown to predict all-cause and respiratory mortality better than FEV₁ alone and is referenced in COPD prognostic assessment, including discussions around pulmonary rehabilitation and transplantation.
Frequently asked questions
What does BODE stand for?
Body-mass index, airflow Obstruction (FEV₁ % predicted), Dyspnoea (mMRC grade) and Exercise capacity (6-minute walk distance). These four domains combine into a score from 0 to 10.
Why is the BODE index better than FEV₁ alone?
Mortality in COPD reflects nutritional status, symptoms and exercise capacity as well as airflow limitation. By combining all four, the BODE index predicts survival more accurately than FEV₁ on its own.
What BODE score indicates a poor prognosis?
A score of 5–10 falls in the higher-risk band with markedly reduced four-year survival, whereas 0–2 indicates the best survival. The score should inform, not replace, individual clinical assessment.
Why does a low BMI add a point?
Being underweight is independently linked to worse outcomes in COPD, so a BMI of 21 or below scores one point. A high BMI does not add points in this index.
Can the BODE index be used during an exacerbation?
No. It is designed for stable COPD. During an exacerbation, lung function, dyspnoea and walk distance are not representative, so the score would be unreliable.
References
- Celli BR, Cote CG, Marin JM, et al. The body-mass index, airflow obstruction, dyspnea, and exercise capacity index in chronic obstructive pulmonary disease. N Engl J Med. 2004;350(10):1005–1012.
- Global Initiative for Chronic Obstructive Lung Disease (GOLD). Global Strategy for the Diagnosis, Management, and Prevention of COPD.
About the creator
Celli BR et al.
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