Table 1.

Wells score.

Clinical symptoms of DVT	3 points
Other diagnosis less likely than PE	3 points
Heart rate > 100/min	1.5 points
Immobilization ≥ 3 days or surgery in previous four weeks	1 .5 points
Previous DVT or PE	1.5 points
Haemoptysis	1 point
Malignancy	1 point