A growing body of evidence obtained during the past 6 years suggests a significant role for inherited thrombophilia in the development of gestational vascular complications. Case-control and cross-sectional studies have demonstrated that thrombophilia is more prevalent in cohorts of women with pregnancy loss. Placental pathological findings in women with thrombophilia are hallmarked by thrombosis and fibrin deposition. Preliminary case-control studies suggest that low-molecular-weight heparins (LMWH) are effective in preventing pregnancy loss in women with thrombophilia and previous fetal wastage.