The Bronchiectasis Severity Index
| Domain | Points |
| Age years | |
| <50 | 0 |
| 50–69 | 2 |
| 70–79 | 4 |
| ≥80 | 6 |
| Body mass index kg·m-2 | |
| <18.5 | 2 |
| ≥18.5 | 0 |
| FEV1 % predicted | |
| >80 | 0 |
| 50–80 | 1 |
| 30–49 | 2 |
| <30 | 3 |
| Hospital admissions in the past 2 years | |
| Yes | 5 |
| No | 0 |
| Exacerbation frequency in the past 12 months | |
| 0–2 | 0 |
| ≥3 | 2 |
| MRC dyspnoea score | |
| 1–3 | 0 |
| 4 | 2 |
| 5 | 3 |
| Bacterial colonisation | |
| Pseudomonas aeruginosa | 3 |
| Other potentially pathogenic microorganisms | 1 |
| None | 0 |
| Radiological severity | |
| ≥3 lobes involved or cystic bronchiectasis | 1 |
| <3 lobes involved | 0 |
0–4 points: low risk of hospitalisation and mortality; 5–8 points: moderate risk of hospitalisation and mortality; ≥9 points: high risk of hospitalisation and mortality. FEV1: forced expiratory volume in 1 s; MRC: Medical Research Council.