Wells Score for Pulmonary Embolism

Formula

Sum of weighted items (maximum 12.5). Three-tier: below 2 low, 2 to 6 moderate, above 6 high. Two-tier: 4 or below unlikely, above 4 likely.

Limitations

• Item 2 is a subjective clinician judgement.
• Depends on prevalence; must be combined with D-dimer or imaging according to the local pathway.

References

1. Derivation of a simple clinical model to categorize patients probability of pulmonary embolism: increasing the models utility with the SimpliRED D-dimer. Wells PS, Anderson DR, Rodger M, et al. Thromb Haemost. 2000;83(3):416-420. PMID 10744147