Muñoz, MLaso-Morales, M JGómez-Ramírez, SCadellas, MNúñez-Matas, M JGarcía-Erce, J A2023-01-252023-01-252017-04-06http://hdl.handle.net/10668/11060Pre-operative anaemia in patients undergoing major surgical procedures has been linked to poor outcomes. Therefore, early detection and treatment of pre-operative anaemia is recommended. However, to effectively implement a pre-operative anaemia management protocol, an estimation of its prevalence and main causes is needed. We analysed data from 3342 patients (44.5% female) scheduled for either: elective orthopaedic surgery (n = 1286); cardiac surgery (n = 691); colorectal cancer resection (n = 735); radical prostatectomy (n = 362); gynaecological surgery (n = 203) or resection of liver metastases (n = 122). For both sexes, anaemia was defined by a haemoglobin level  5 mg.l-1 ); iron sequestration by transferrin saturation  100 ng.ml-1 ; and low iron stores by transferrin saturation > 20% and ferritin 30-100 ng.ml-1 . The overall prevalence of anaemia was 36%, with differences according to the type of surgery. Laboratory parameters allowing classification of iron status were available for 2884 patients. Among those with anaemia (n = 986), 677 (69%) were women, 608 (62%) presented with absolute iron deficiency, 101 (10%) with iron sequestration; and 150 (5%) with low iron stores. Iron status alterations were similar in women with haemoglobin 20% and ferritin 30-100 ng.ml-1 . The overall prevalence of anaemia was 36%, with differences according to the type of surgery. Laboratory parameters allowing classification of iron status were available for 2884 patients. Among those with anaemia (n = 986), 677 (69%) were women, 608 (62%) presented with absolute iron deficiency, 101 (10%) with iron sequestration; and 150 (5%) with low iron stores. Iron status alterations were similar in women with haemoglobinenanaemiairon deficiencyiron sequestrationiron storesmajor surgeryAgedAged, 80 and overAnemiaCohort StudiesElective Surgical ProceduresFemaleHemoglobinsHumansIronIron DeficienciesMaleMiddle AgedPreoperative Careresearch article28382661open access10.1111/anae.138401365-2044https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/anae.13840