Wells Score Calculator
Clinical prediction rule for deep vein thrombosis (DVT) and pulmonary embolism (PE) risk stratification.
Wells DVT Score
0
DVT unlikely. Consider D-dimer testing.
When to use the Wells Score
Use the Wells Score when a patient presents with symptoms suggestive of DVT (unilateral leg swelling, calf pain) or PE (pleuritic chest pain, dyspnoea, haemoptysis). It helps determine pre-test probability to guide investigation with D-dimer testing or imaging.
How to interpret
- DVT - Low (≤0): ~5% probability. D-dimer may safely exclude DVT.
- DVT - Moderate (1-2): ~17% probability. D-dimer or ultrasound recommended.
- DVT - High (≥3): ~53% probability. Ultrasound recommended regardless of D-dimer.
- PE - Unlikely (≤4): Consider D-dimer. If negative, PE effectively excluded.
- PE - Likely (>4): CTPA recommended. Do not wait for D-dimer before imaging.
Clinical context
The Wells Score should be used as part of a structured diagnostic pathway. NICE guidelines recommend combining Wells with D-dimer testing or imaging. A negative D-dimer combined with a low Wells Score can safely exclude VTE in most patients. Clinical judgement should always complement scoring tools.
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