Emergency Medicine

Wells Score for PE

Pre-test probability of pulmonary embolism.

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use in suspected pulmonary embolism to estimate pre-test probability and guide D-dimer vs imaging decisions.

Why use

It directs investigations appropriately and underpins the PE diagnostic pathway.

Advice

A common two-level approach: ≤4 = "PE unlikely" (proceed to D-dimer); >4 = "PE likely" (proceed to CTPA). Follow your local pathway.

Evidence & references

  1. Wells PS et al. Derivation of a simple clinical model to categorize patients’ probability of pulmonary embolism. Thromb Haemost. 2000.

About the creator

Wells PS et al.

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