Many patients who are candidates for scheduled major surgery have a pre-operative iron deficiency which is poorly diagnosed. The management of per-operative iron deficiency is a part of the concept of the "Patient Blood Management", which is a concept recommended by health regulatory agencies in many countries. The objective of this study is to obtain updated data on the prevalence of iron deficiency in France in patients undergoing a scheduled major surgery, applying the French recommendations (determination of ferritinemia and Transferrin Saturation Factor).

Inclusion Criteria:

• Patient, male or female, over 18 years of age
• Patient with scheduled major surgery
• Patient with signed consent

Exclusion Criteria:

• Protected patient : major under guardianship, tutorship or other legal protection, deprived of liberty by judicial or administrative decision
• Pregnant or breastfeeding woman