STA®-Liatest®D-Di-Exclusion of Venous Thromboembolism

The study population will be selected from prospective, consecutive ambulatory outpatients suspected of having venous thromboembolism. These patients will first be evaluated using the Wells score: * patients with low or moderate pretest probability will be considered for D-dimer testing, those with D-dimer positive will be considered for an imaging procedure, * patients with high pretest probability will be considered for an imaging procedure. Patients with "low or moderate" pretest probability and a negative D-Dimer result will be followed for 3 months to evaluate potential development of deep venous thrombosis and/or pulmonary embolism. These patients will be contacted by phone 3 month after their first visit.