Fig. 1.

Chart shows proposed algorithm to evaluate and treat perioperative anaemia. *If TSAT is unavailable, assess clinical context for conditions that may falsely elevate ferritin despite ID. †If ferritin is > 100 μg/L, TSAT < 20% is required to support diagnosis of IDA. If anaemia cannot be classified based on these, contact a haematologist. CRP: C-reactive protein; eGFR: estimated glomerular filtration rate; EPO: erythropoietin; F: female; Hb: haemoglobin; ID: iron deficiency; IDA: iron deficiency anaemia; IV: intravenous; M: male; TSAT: transferrin saturation