According to the WHO, anemia is one of the ten most serious health problems in the world. During pregnancy, it affects 42% of women worldwide and 25% in France. It is associated with an increased risk of perinatal morbidity and mortality, and recourse to blood transfusion. The blood transfusion is itself also a source of thromboembolic morbidity and mortality, infectious diseases and pulmonary pathologies. In addition, the risk of hemorrhage, particularly during delivery, is inherent to all pregnancies and difficult to predict. Since 2010, the WHO has defined the rational use of blood products as the 4th global priority, and the need for countries to reduce blood transfusion. It introduces the concept of Patient Blood Management (PBM). This is a set of measures designed to manage anemia and bleeding in surgical patients, while avoiding the need for transfusion. These measures include preoperative screening for anemia and martial deficiency, iron and vitamin supplementation, intraoperative bleeding control and optimization of postoperative blood balance. Recommended by several national programs, PBM has developed rapidly in orthopedic and cardiac surgery, where numerous studies have demonstrated its effectiveness, particularly in terms of transfusion savings. In obstetrics, however, the implementation of PBM remains less widespread, notably due to the difficulty of getting teams on board, and the absence of protocolization. However, given the high prevalence of anemia in pregnant women, and the inherent risk of hemorrhage in all deliveries with potential recourse to blood transfusion, personalized optimization of PBM is a major challenge in obstetrics. The PBM is currently being implemented in routine practice in the CHITS maternity department, in line with recommendations. In this context, our research aims to assess the impact of this new approach. Our main hypothesis is that implementation of a PBM protocol would reduce the rate of transfusion in delivery hemorrhage.