Bronchiectasis Severity Index (BSI)
Bronchiectasis Severity Index (Chalmers 2014): predicts mortality and exacerbation risk from age, BMI, FEV1, colonization, radiology, and exacerbation history.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Age
- 72
- BMI
- 17
- FEV1
- 45
- Exacerbations in the prior year
- 3
- MRC dyspnea grade
- 4
- Hospital admission in the prior 2 years
- Yes
- Pseudomonas colonization
- Yes
Result: BSI 20: high severity.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Bands
- low 0-4, intermediate 5-8, high >= 9, with mortality and hospitalization risk rising across the bands.
What you enter
- Age (years)
- BMI (kg/m^2)
- FEV1 (% predicted)
- Exacerbations in the prior year
- MRC dyspnea grade (1-5)
- Hospital admission in the prior 2 years
- Pseudomonas colonization
- Colonization with another organism
The other 2 fields
- 3 or more lobes involved
- Cystic bronchiectasis
How this is calculated
- Items
- age, BMI, FEV1 %, a prior-2-year admission, >= 3 exacerbations, MRC dyspnea (4 = +2, 5 = +3), Pseudomonas (+3), other organism (+1), and radiology (>= 3 lobes +1, cystic +1).
Chalmers JD, Goeminne P, Aliberti S, et al. The bronchiectasis severity index. An international derivation and validation study. Am J Respir Crit Care Med. 2014;189(5):576-585. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.