| Predictors | Point score |
| Cancer | +2 |
| Heart failure | +1 |
| Previous deep vein thrombosis | +1 |
| Systolic blood pressure < 100 mmHg | +2 |
| PaO2< 8kPa | +1 |
| Deep vein thrombosis shown by ultrasound | +1 |
| Total score | 0‐8 |
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