Diagnosis and Management of Anemia with Low Iron and High Ferritin

Interpretation of Laboratory Values

The combination of low serum iron, high ferritin, low transferrin saturation, and low total iron-binding capacity is diagnostic of anemia of chronic disease, also known as anemia of inflammation, according to the Journal of Crohn's and Colitis 1, 2
In anemia of chronic disease, inflammatory cytokines increase hepcidin production, which blocks iron absorption from the gut and prevents iron release from macrophages, leading to functional iron deficiency despite adequate or elevated iron stores, as reported in the American Journal of Hematology 3
The transferrin saturation below 16% indicates inadequate iron availability for erythropoiesis despite the elevated ferritin, as noted in the Journal of Crohn's and Colitis 1, 4
The high ferritin reflects an acute-phase reaction during inflammation rather than true iron sufficiency, according to the Journal of Crohn's and Colitis 1, 5

Measure inflammatory markers to confirm the presence of inflammation, and when inflammation is present, ferritin levels >100 μg/L with transferrin saturation <16% are consistent with anemia of chronic disease, as recommended by the Journal of Crohn's and Colitis 1, 2
Consider measuring soluble transferrin receptor if available, as this would be high in true iron deficiency but normal or low in pure anemia of chronic disease, according to the Journal of Crohn's and Colitis 1, 6
Evaluate reticulocyte hemoglobin concentration if available, as a value <30 pg is predictive of response to intravenous iron, as reported in the American Journal of Hematology 3, 7

Intravenous iron supplementation is recommended as the first-line treatment for anemia of chronic disease with low transferrin saturation, as suggested by the Journal of Crohn's and Colitis and the American Journal of Hematology 1, 3
IV iron preparations such as iron sucrose or ferric carboxymaltose have shown efficacy in clinical trials for anemia of chronic disease, according to the American Journal of Hematology 3, 7
Dosing should be calculated based on body weight and hemoglobin deficit, as recommended by the Journal of Crohn's and Colitis and Kidney International Supplements 1, 8

Reassess hemoglobin, iron studies, and inflammatory markers 4-6 weeks after treatment, as suggested by the Journal of Crohn's and Colitis 1, 2
Expect improvement in hemoglobin levels by 1-2 g/dL with successful treatment, as reported in the American Journal of Hematology 3, 7
Treat the underlying inflammatory condition to address the root cause of anemia of chronic disease, according to the Journal of Crohn's and Colitis 1
Red blood cell transfusions should be reserved for severe symptomatic anemia, as recommended by the Journal of Crohn's and Colitis and the American Journal of Hematology 1, 3