Table 1 Clinical probability (the Wells score) of pulmonary embolism
From: Capnometry in suspected pulmonary embolism with positive D-dimer in the field
Wells score* | |
|---|---|
Variable | Points |
Previous DVT or PE | + 1.5 |
Recent surgery or immobilization | + 1.5 |
Cancer | + 1 |
Haemoptysis | + 1 |
Heart rate > 100 beats/min | + 1.5 |
Clinical signs of DVT | + 3 |
Alternative diagnosis less likely than PE | + 3 |
Clinical probability (3 levels) | Total |
Low | 0-1 |
Intermediate | 2-6 |
High | > _7 |
Clinical probability (2 levels) | Total |
PE unlikely | 0-4 |
PE likely | > 4 |