Wells' Criteria for Pulmonary Embolism

Estimates pretest probability of pulmonary embolism to guide D-dimer testing versus direct imaging.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Clinical signs/symptoms of DVT (leg swelling, pain on palpation)

PE is the #1 diagnosis, or equally likely

Heart rate > 100 bpm

Immobilization ≥3 days, or surgery in the past 4 weeks

Previous, objectively diagnosed DVT or PE

Hemoptysis

Malignancy (treated within 6 months, or palliative)

Result

0 points

Low probability

Two-tier modelPE Unlikely

Low probability (three-tier model). Two-tier model: score ≤4 = "PE unlikely" (consider D-dimer to rule out); score >4 = "PE likely" (proceed to CTPA/V-Q, D-dimer not recommended to rule out).

Source

Wells PS, Anderson DR, Rodger M, et al. Derivation of a simple clinical model to categorize patients' probability of pulmonary embolism. Thromb Haemost. 2000;83(3):416-420.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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