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pulmonology & sleepscoring tool

BODE Index (COPD Prognosis)

The BODE index is a multidimensional COPD prognostic score incorporating Body mass index, airflow Obstruction (FEV₁), Dyspnoea (mMRC), and Exercise capacity (6MWD). It predicts mortality better than FEV₁ alone.

inputs

Low BMI in COPD reflects muscle wasting and is an independent mortality predictor

✓ when to use

Use in stable COPD patients for prognostic assessment, transplant evaluation, and treatment intensity discussions. The BODE captures systemic effects of COPD (cachexia, deconditioning) that FEV₁ alone misses. Useful for referral to pulmonary rehabilitation and transplant programs.

✗ when not to use

Requires a 6-minute walk test, which is not available in all settings (not part of routine primary care). Not applicable during acute exacerbations — assess in stable state. The BODE index was derived before the era of modern COPD pharmacotherapy (triple inhalers, biologics) and surgical interventions (LVRS, transplant) which may modify prognosis.

clinical pearls

  • BODE captures the multisystemic nature of COPD. FEV₁ measures airflow limitation only; BODE adds exercise capacity (deconditioning), dyspnoea (symptom burden), and BMI (nutritional/muscle status). This is why BODE predicts mortality better than FEV₁ alone.
  • Low BMI (≤21) in COPD is a marker of muscle wasting and cachexia, not 'healthy weight'. It independently predicts mortality. Nutritional support and pulmonary rehabilitation can improve this component.
  • A BODE index of 7–10 should prompt consideration of lung transplant referral in appropriate candidates (age, comorbidities, psychosocial suitability). ISHLT guidelines suggest referral at BODE 5–6 and listing at 7+.
  • The 6-minute walk test (6MWT) requires a 30-metre corridor, a timer, and standardised instructions. It measures functional exercise capacity and correlates with daily activity levels, oxygen requirements, and survival.
  • BODE can improve after pulmonary rehabilitation, smoking cessation, and pharmacotherapy optimisation. It is useful not just for prognosis but for tracking response to interventions.

related tools

mmrcDyspnoea component of BODEcat-copdSymptom assessmentbmiBMI component of BODE