Patient Blood Management Charité (PBM-Charité): Structured Detection, Differentiated Diagnostics and Therapy of Preoperative Anemia and Use of Machine Autotransfusion in Elective Interventions

Prospective: Inclusion Criteria: * age ≥ 18 years * male and female patients * patients eligible for inclusion: by the patient, preoperatively * patients who are insured with BARMER * patients with preoperative anemia and an elective (N5) surgical intervention with a probability of transfusion \> 10% additionally for the use of MAT: * indication of machine autotransfusion * high blood loss (\> 500ml / 10-20 % of estimated blood volume) beside of indication interventions (surgery under dual platelet inhibition, high individual bleeding risk, special antibodies / rare blood group, rejection of allogeneic blood) Exclusion Criteria: * patients with emergency interventions * rejection of study participation * pregnancy, elective caesarean section or breastfeeding * not enough German language skills * accommodation in an institution because of judicial or administrative order * employee of Charité * missing of declaration of consent Retrospective: Inclusion Criteria: -Data since September 2021-February 2024 of patients who are not insured with BARMER with elective (N5) interventions with a transfusion probability \> 10% (indication list) with a preoperatively existing anemia additionally for the use of MAT: * indication of machine autotransfusion * high blood loss (\> 500ml / 10-20 % of estimated blood volume) beside of indication interventions (surgery under dual platelet inhibition, high individual bleeding risk, special antibodies / rare blood group, rejection of allogeneic blood)