How this calculator works
This is the original weighted Wells model. DVT signs and PE judged more likely than alternatives each add 3; tachycardia, recent immobilization/surgery and prior VTE each add 1.5; haemoptysis and malignancy each add 1. Two-level classification uses over 4 for PE likely. Three-level classification uses below 2, 2 to 6 and above 6. Neither low probability nor PE-unlikely means PE has been excluded. The result is an estimate for information only and is not medical advice.
Formula
Sum criterion points. Two-level: ≤4 unlikely, >4 likely. Three-level: <2 low, 2 to 6 moderate, >6 high.
Worked example
Heart rate above 100 plus haemoptysis gives 2.5 points. Adding clinical DVT signs gives 5.5 points, which is PE likely in the two-level scheme.
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Frequently asked questions
Can this diagnose PE?
No. It estimates pretest probability and must be combined with an appropriate testing pathway.
Does heart rate exactly 100 score?
No. The weighted Wells criterion is above 100 beats/min.
Can I use this to decide whether symptoms are urgent?
No. New chest pain, breathlessness or collapse can require urgent assessment regardless of score.