Cancer (treated or diagnosed within the prior 6 months)

1

Paralysis, paresis, or recent lower limb immobilization in a cast

1

Recently bedridden for >3 days or major surgery within the prior 4 weeks

1

Localized tenderness along distribution of the deep veins of the lower extremitya

1

Edema of the entire lega

1

Calf swelling >3 cm compared to the asymptomatic leg (measured 10 cm below the tibial tuberosity)a

1

Pitting edema (more prominent on the symptomatic leg)a

1

Visible collateral superficial veins (nonvaricose)a

1

Other diagnosis as likely or more likely than deep vein thrombosis

–2

Interpretation

Low clinical probability: Total score ≤0

Intermediate clinical probability: Total score 1-2

High clinical probability: Total score ≥3

a If symptoms occur in both lower limbs, the limb in which symptoms are more severe should be assessed.