Iron Deficiency Anemia in CKD Stage 2

Diagnosis and Evaluation

• The American Journal of Kidney Diseases recommends that transferrin saturation <20% is definitive for iron deficiency in CKD, and a value of 24% is considered borderline low 2
• The British Journal of Anaesthesia suggests that elevated TIBC is consistent with iron deficiency as the body attempts to capture more iron, with a value of 270 being indicative of this condition 3
• The American Journal of Hematology and the British Journal of Anaesthesia recommend evaluating for gastrointestinal malignancy as a source of chronic blood loss, especially in older adults with iron deficiency, before initiating iron therapy 3, 4

Iron Replacement Strategy

• The American Journal of Kidney Diseases recommends administering 500-1,000 mg of iron dextran as a single IV infusion after a 25 mg test dose, or giving 100-125 mg IV weekly for 8-10 doses, as a dosing regimen for IV iron therapy 2
• The American Journal of Hematology suggests that iron gluconate (250 mg twice monthly for 3 months) or iron sucrose are also effective alternative IV formulations 4
• The American Journal of Kidney Diseases and Praxis Medical Insights recommend checking hemoglobin and iron parameters 2 weeks after completing the iron course, and withholding IV iron if ferritin exceeds 500 ng/mL or TSAT exceeds 30-50% 1, 2

Target Iron Parameters and Monitoring

• The American Journal of Kidney Diseases recommends target iron parameters of transferrin saturation >20% (ideally >30%), ferritin 100-500 ng/mL, and hemoglobin 11-12 g/dL 2, 1, 3
• The American Journal of Kidney Diseases and Praxis Medical Insights recommend monitoring iron parameters and hemoglobin every 3 months once stable, and monitoring renal function given CKD diagnosis 1, 2, 3, 4

ESA Therapy and Common Pitfalls

• Praxis Medical Insights recommends not starting erythropoietin-stimulating agents (ESAs) initially, but rather completing a trial of IV iron therapy and reassessing hemoglobin response, and only considering ESAs if hemoglobin fails to improve adequately after completing IV iron course 1
• The American Journal of Kidney Diseases and the American Journal of Hematology recommend avoiding common pitfalls such as assuming anemia is solely due to CKD, relying on oral iron in CKD patients, skipping the GI evaluation, and starting ESAs before optimizing iron 2, 3, 4, 1