Wells’ score calculator

Pre-test probability of deep vein thrombosis (DVT)

Commentary

This scoring system helps to evaluate the clinical probability of deep vein thrombosis (DVT), before laboratory or radiology testing.1 In the original publication, a three-way scoring system was used. Patients with a Wells’ score of -2 to 0 were at low risk of DVT on ultrasound (3%), those with a score of 1 or 2 were at intermediate risk (17%), and those with a score of 3 or more at high risk (75%).1

In a subsequent publication incorporating D-dimer testing, a two-way scoring system was used. Patients were considered at low risk of DVT if the Wells’ score was < 2 and D-dimmer was negative.2 Wells’ score should be applied as part of a clinical algorithm, in conjunction with appropriate D-dimer and ultrasound testing.