Abstract
Factor V Leiden, formed by a genetic mutation, disrupts the body's anticoagulation defense system. It was isolated as recently as 1994 as a risk factor for venous thromboembolism. Factor V Leiden has also been linked to preeclampsia, pregnancy loss, and fetal growth restriction. In addition, factor V Leiden has implications for women who are not pregnant. The most effective screening tool is a thorough personal and family history related to thrombosis. For women with a positive factor V Leiden screen, counseling regarding the risks of thrombosis is essential.