Wells’ Criteria for Pulmonary Embolism
Objectifies risk of pulmonary embolism. The Wells’ Criteria risk stratifies patients for pulmonary embolism (PE) and provides an estimated pre-test probability. The physician can then chose what further testing is required for diagnosing pulmonary embolism (I.E. d-dimer or CT angiogram).
Details Formula Study characteristics Files & References
Model author
Model ID
154
Version
1.4
Revision date
2017-08-23
Specialty
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Model type
Linear model (Calculation)
Status
public
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Wells' score for pulmonary embolism:
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Wells' score for pulmonary embolism:

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Outcome stratification

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Result interpretation

The Wells’ Criteria risk stratifies patients for pulmonary embolism (PE), and has been validated in both inpatient and emergency department settings. Its score is often used in conjunction with d-dimer testing to evaluate for PE. There must first be a clinical suspicion for PE in the patient (this should not be applied to all patients with chest pain or shortness of breath, for example). Wells' can be used with either 3 tiers (low, moderate, high) or 2 tiers (unlikely, likely). We recommend the two tier model as this is supported by ACEP’s 2011 clinical policy on PE. Wells’ is often criticized for having a “subjective” criterion in it (“PE #1 diagnosis or equally likely”) Wells’ is not meant to diagnose PE but to guide workup by predicting pre-test probability of PE and appropriate testing to rule out the diagnosis.

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Calculations alone should never dictate patient care, and are no substitute for professional judgement. See our full disclaimer.

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Disclaimer: Calculations alone should never dictate patient care, and are no substitute for professional judgement.