Clinical symptoms of DVT (leg swelling, pain with palpation)

3.0

Other diagnosis less likely than pulmonary embolism

3.0

Heart rate >100

1.5

Immobilization (3 days) or surgery in the previous four weeks

1.5

Previous DVT/PE

1.5

Hemoptysis

1.0

Malignancy

1.0

Probability

Score

Traditional clinical probability assessment

High

>6.0

Moderate

2.0 to 6.0

Low

<2.0

Simplified clinical probability assessment*

PE likely

>4.0

PE unlikely

4.0