Wells Pretest Probability ScoreStrategy for assessing PE and DVT

Clinical signs and symptoms of DVT (objectively measured calf swelling or pain with palpation of deep vein region)

3.0

An alternative diagnosis is less likely than PE

3.0

Heart rate >100 beats per minute

1.5

Immobilization or surgery in the previous 4 weeks

1.5

Previous DVT or PE

1.5

Hemoptysis

1.0

Malignancy (on treatment, treated in the past 6 months, or palliative care)

1.0

<2 points

3.6

Low

2 to 6 points

20.5

Moderate

>6 points

66.7

High

Active cancer (patient either receiving treatment for cancer within the previous 6 months or currently receiving palliative treatment)

1.0

Paralysis, paresis, or recent case immobilization of the lower extremities

1.0

Recently bedridden for ≥3 days, or major surgery within the previous 12 weeks requiring general or regional anesthesia

1.0

Localized tenderness along the distribution of the deep venous system

1.0

Entire leg swelling

1.0

Calf swelling at least 3 cm larger than that on the asymptomatic side (measured 10 cm below tibial tuberosity)

1.0

Pitting edema confined to the symptomatic leg

1.0

Collateral superficial veins (non-varicose)

1.0

Previously documented deep vein thrombosis

1.0

Alternative diagnosis at least as likely as deep vein thrombosis

-2.0

-2 - 0

1-2

3-8