Incremental value of compression ultrasound sonography in the emergency department

Table 1 Wells’ score

Features	Score, points
Active cancer (in treatment or treated in the last 6 mo or under palliative care)	1
Paralysis, paresis, or recent plaster immobilization of the lower extremity	1
Bedridden recently > 3 d or major surgery within 12 wk	1
Localized tenderness along the deep venous system	1
Entire leg swollen	1
Calf swelling > 3 cm compared to the other leg	1
Pitting edema, confined to symptomatic leg	1
Collateral (nonvaricose) superficial veins present	1
Previously documented DVT	1
Alternative diagnosis to DVT as likely or more likely	-2

DVT: Deep venous thrombosis.