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BackgroundThe link between blood hypercoagulability, endothelial cell activation and infertility or in vitro fertilization (IVF) failure is a puzzling issue. Activation of platelets, endothelial cells and blood coagulation, proinflammatory and angiogenetic potential play important role in implantation and early embryonic development. Biomarkers of cellular hypercoagulability are associated with high risk of IVF failure. Soluble Leukemia Inhibitory Factor (LIF), an interleukin 6 class cytokine expressed in the trophectoderm of the developing embryo is an important regulator in the establishment of pregnancy. Endoglin (Eng), a co-receptor for TGF-β1 and TGF-β3 is implicated in vascular complications of pregnancy and particularly in preeclampsia.