Prevention of Postpartum Venous Thromboembolism in Women at Intermediate Risk

Inclusion Criteria: * Women at intermediate risk of VTE during post-partum= with a 3% or more risk of VTE based on a validated prediction model\* or International guidelines (ACCP 2012). * Age over 18 years * Delivery between 6 hours and \< 36 hours * Written informed consent * Definition: Intermediate risk is defined as ≥ 3%, based on risk prediction model developed by Sultan et al taking in account: smoking, varicose veins, obesity, comorbidities, diabetes, pre-eclampsia, post-partum hemorrhage, postpartum infection, emergency or elective section or following ACCP guidelines: one major risk factor or two minor risk factors. Exclusion Criteria: * Previous personal history of VTE * LMWH started during antenatal period * Need for anticoagulation at curative dose * Contraindication to LMWH (previous heparin induced thrombopenia, hemostatic impairment, known severe renal insufficiency) * Women who received more than two doses of LMWH since delivery * Unable or refusal to give informed consent * Aspirin at a daily dose 100 mg or dual antiplatelet therapy * Previous inclusion in Mum-VTE study * Concomitant participation in another therapeutic study