Detection of Bleeding Disorders Diagnosed After Vaginal Delivery Complicated by Severe Postpartum Hemorrhage

Inclusion Criteria: * Women ≥ 18 years old * Who experienced severe postpartum hemorrhage, defined as blood loss ≥ 1000 mL, following a vaginal delivery in the previous 12 months, in a maternity unit in Finistère Exclusion Criteria: * Women who are pregnant at the time of inclusion * Women with a known hereditary bleeding disorder (Willebrand's disease, hemophilia carrier, etc.) or acute or chronic Immune thrombocytopenia (ITP) prior to delivery. * Women with a known other bleeding pathology prior to delivery * Women taking a treatment that interferes with hemostasis, such as aspirin, anticoagulants or non-steroidal anti-inflammatory drugs (biological sampling may be postponed until after the interfering treatment has stopped, in the case of occasional use of the latter). * Women on long-term anticoagulant or antiaggregant therapy * Women under legal protection, * Women not affiliated to the French social security system.