Comparative evaluation of D-dimer assays for exclusion of deep venous thrombosis in symptomatic outpatients.

Diagnostic work-up of patients sent to the hospital for diagnosing of deep venous thrombosis (DVT) often combines the determination of D-dimer and the application of a clinical probability score. To fulfill diagnostic as well as economic needs, D-dimer assays should exhibit a high negative predictive value (NPV) as well as reasonable specificity. In this study, we evaluated both a latex-enhanced immunoassay for use on routine coagulation analyzers and a radial partition immunoassay (RPIA) for use on a point-of-care analyzer. Samples included were from 344 outpatients with suspected deep venous thrombosis. Among them, 100 had deep venous thrombosis. Results obtained for both assays show a good efficiency for exclusion of deep venous thrombosis with well-acceptable specificity.