| Predictor | Points | |
| Gender | ||
| G | Female | 0 |
| Male | 1 | |
| Age years | ||
| A | ≤60 | 0 |
| 61–65 | 1 | |
| >65 | 2 | |
| Physiology | ||
| FVC % predicted | ||
| >75 | 0 | |
| 50–75 | 1 | |
| <50 | 2 | |
| P | DLCO % predicted | |
| >55 | 0 | |
| 36–55 | 1 | |
| ≤35 | 2 | |
| Cannot perform | 3 |
Maximum possible points=8. FVC: forced vital capacity; DLCO: diffusing capacity of the lung for carbon monoxide.