Risk assessment for recurrent venous thrombosis

(Number of risk factors identified by laboratory screening for thrombophilia in 158 patients without cancer with two episodes of unprovoked venous thrombosis, 3 weeks after the incident event, patients were screened for deficiency of antithrombin, protein C, or protein S; presence of lupus anticoagulant, factor V Leiden, factor II G20210A; and high concentrations of homocysteine, factor VIII, or factor IX.)

Recurrent Thrombosis is going to increase the morbidity and mortality. If there are two episodes of unprovoked DVT  without cancer, we can expect that there is some kind of hypercoagulable condition with one or more risk factors.