The Wells rule does not adequately rule out deep venous thrombosis in primary care patients

and colleagues developed a diagnostic rule to estimate the prob-ability of the presence of deep venous thrombosis (DVT). The accuracy of the Wells rule has not been properly validated for use in primary care patients in whom DVT is suspected. Objective: To validate the diagnostic accuracy of the Wells rule, with and without D-dimer testing, in a primary care setting. Design: Cross-sectional study with prospective data collectio