Management of Preoperative Anemia

Diagnosis and Evaluation

The British Journal of Anaesthesia recommends ordering a comprehensive laboratory evaluation to identify the underlying cause of anemia before initiating any treatment 1, 2, 3
Assess iron status by measuring serum ferritin and transferrin saturation (TSAT) to diagnose iron deficiency anemia 1, 4, 5
Screen for nutritional deficiencies by measuring vitamin B12 and folate levels 1, 6
Evaluate renal function by measuring serum creatinine and glomerular filtration rate (GFR) to identify chronic kidney disease 1, 2

For confirmed iron deficiency anemia, the British Journal of Anaesthesia recommends oral iron therapy with 40-60 mg elemental iron daily in divided doses if surgery is more than 6-8 weeks away 7, 5
For moderate-to-severe anemia with surgery within 2-3 weeks, intravenous iron is preferred 5, 8
The British Journal of Anaesthesia recommends treating vitamin B12 or folate deficiency with appropriate vitamin supplementation 1, 6
For chronic kidney disease, refer to nephrology for management and consider erythropoiesis-stimulating agents (ESAs) with concurrent IV iron 1, 9

Ideally, check hemoglobin 28 days before scheduled surgery to allow sufficient time for evaluation and treatment 1, 2, 9, 5, 8
Consider delaying elective surgery if newly diagnosed anemia is detected close to the surgical date 2, 4
For absolute iron deficiency with a gastrointestinal source, refer to gastroenterology to rule out gastrointestinal malignancy as the source of chronic blood loss 1, 6
For inflammatory bowel disease patients, IV iron is particularly indicated due to hepcidin-mediated inhibition of oral iron absorption 5

Treating preoperative anemia appropriately reduces perioperative morbidity and mortality, red blood cell transfusion requirements, hospital length of stay, and postoperative complications 3, 9, 5
Treatment also improves postoperative physical rehabilitation and quality of life 5

A ferritin level of 12 ng/mL suggests depleted iron stores, according to the British Journal of Anaesthesia 10, 11
The combination of low ferritin and high iron saturation is highly unusual and warrants further evaluation, as recommended by the British Journal of Anaesthesia 10, 11

The British Journal of Anaesthesia recommends that surgery should not be delayed solely based on iron studies, but evaluation of iron metabolism is essential 10, 12
Repeat iron studies, complete blood count, reticulocyte count, and comprehensive metabolic panel are necessary to confirm accuracy and assess actual hemoglobin level, as suggested by the British Journal of Anaesthesia 10, 11, 12

If hemoglobin is low, the British Journal of Anaesthesia recommends delaying surgery for elective procedures more than 4 weeks away to complete diagnostic evaluation and treat underlying cause 10, 12
For urgent or semi-urgent surgery, proceed with surgery but optimize perioperatively, as recommended by the British Journal of Anaesthesia 10, 12

The British Journal of Anaesthesia advises against delaying necessary surgery for prolonged workup if the patient's hemoglobin is adequate and they are otherwise stable for the planned procedure 10, 12

The British Journal of Anaesthesia recommends verifying hemoglobin level immediately, repeating iron studies, consulting hematology if the pattern persists, ensuring adequate hydration, and planning for potential blood conservation strategies 10, 11, 12
The presence of preoperative anemia is associated with increased morbidity and mortality, but the decision to proceed depends on the urgency of surgery, severity of anemia, and ability to correct it in the available timeframe, as stated by the British Journal of Anaesthesia 10, 12