Iron Overload Beyond Hemochromatosis

Primary Causes of Non-Hemochromatosis Iron Overload

The American Association for the Study of Liver Diseases recommends that iron overload in the spleen and liver, excluding hemochromatosis, be attributed to iron-loading anemias, transfusional iron overload, chronic liver diseases, and rare genetic disorders affecting non-HFE iron regulatory proteins 1, 2, 3
Iron-loading anemias, such as thalassemia major, cause the most severe secondary iron overload due to increased intestinal absorption and transfusional iron, with the American College of Gastroenterology suggesting iron chelation therapy with deferoxamine 1, 2, 3
The European Association for the Study of the Liver notes that chronic hemolytic anemias, including sickle cell disease, are associated with iron overload 1, 2
Red blood cell transfusions contain approximately 200-250 mg of iron per unit, contributing to transfusional iron overload, according to the American Medical Association 1, 3

The American Association for the Study of Liver Diseases states that hepatitis C virus infection causes dysregulated hepcidin and increased iron absorption, leading to secondary iron accumulation 1, 2, 3
Hepatitis B virus infection is also associated with iron overload, as noted by the World Health Organization 1, 3
Alcoholic liver disease increases intestinal iron absorption and causes hepatocellular injury, leading to iron overload, according to the National Institute on Alcohol Abuse and Alcoholism 1, 2, 3

The American College of Physicians recommends that transferrin saturation be used as a critical discriminator to distinguish between true iron overload and inflammatory hyperferritinemia, with a saturation of ≥45% suggesting true iron overload 6
MRI R2* quantification reveals distinct distribution patterns, with hemochromatosis and aceruloplasminemia showing predominant hepatic iron and minimal or no spleen iron, as noted by the Journal of Hepatology 4

The American College of Gastroenterology suggests that phlebotomy-responsive conditions, such as African iron overload and porphyria cutanea tarda, be treated similarly to hemochromatosis, with phlebotomy as the primary treatment 1
Iron chelation with deferoxamine is required for thalassemia major and other transfusion-dependent anemias, as well as conditions where phlebotomy is contraindicated due to anemia, according to the American Medical Association 1, 3