| Criteria | Points |
| previous pulmonary embolism or deep venous thrombosis | 1.5 |
| heart rate > 100 beats per min | 1.5 |
| surgery or immobilization < 4 weeks | 1.5 |
| hemoptysis | 1 |
| active cancer | 1 |
| clinical signs of deep venous thrombosis | 3 |
| alternative diagnosis less likely than pulmonary embolism | 3 |
Pulmonary embolism is likely if > 4 points