Wells’ score calculator
Pre-test probability of deep vein thrombosis (DVT)
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.
- Wells PS, Anderson DR, Bormanis J, Guy F, Mitchell M, Gray L et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet. 1997; 350: 1795-8.
- Wells PS, Anderson DR, Rodger M, Forgie M, Kearon C, Dreyer J et al. Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis. N Engl J Med. 2003; 349: 1227-35.