Wells Score for Pulmonary Embolism

Clinical Prediction Rule — PE Pre-Test Probability

Clinical signs/symptoms of DVT Leg swelling, pain with palpation of deep veins

PE is #1 diagnosis, or equally likely Alternative diagnosis less likely than PE

Heart rate > 100 bpm

+1.5

Immobilization or surgery in previous 4 weeks Bedrest ≥3 days or major surgery within 12 weeks requiring general/regional anesthesia

+1.5

Previous DVT/PE Objectively diagnosed

+1.5

Hemoptysis

Malignancy Treatment within 6 months or palliative

Total Score 0

Two-Tier Interpretation PE unlikely

Three-Tier Interpretation Low probability

Score 0 — PE unlikely. If D-dimer negative, PE effectively excluded.