Inherited thrombophilia and fetal loss.

Acquired thrombophilia is a well-established cause of pregnancy loss. Increasing numbers of recent observations suggest that inherited thrombophilia is not only associated with gestational thromboembolism but is also a major cause of fetal loss. This review focuses on association of fetal loss with inherited thrombophilias, including dysfibrinogenemia and protein C, protein S, and antithrombin III deficiencies. Activated protein C resistance and factor V Leiden mutation are frequent causes of pregnancy loss. Thrombophilic states such as factor V Leiden and hyperhomocysteinemia may also play a role in other gestational vascular complications, including intrauterine growth restriction, preeclampsia, and placental abruption. Preliminary reports suggest that antithrombotic therapy may be of value in this setting. The potential application of antithrombotic modalities to prevent fetal loss in women with thrombophilia is discussed.