Health

Wells Score for PE

Clinical probability of pulmonary embolism.

Clinical signs of DVT?

PE is #1 or equally likely diagnosis?

Heart rate > 100?

Immobilization ≥ 3 days or surgery in past 4 wk?

Previous DVT/PE?

Hemoptysis?

Malignancy (treatment within 6 mo)?

Wells Criteria for PE

Score ≤ 4: PE unlikely. > 4: PE likely. Two-level Wells: ≤ 4 → D-dimer → if negative, PE excluded (99% NPV). > 4 → CTPA. Original three-level: < 2 low, 2–6 moderate, > 6 high. Most validated clinical prediction rule for PE. Combines clinical signs with risk factors and gestalt.