Iron Metabolism Disorders

Diagnosis and Characteristics

• Aceruloplasminemia is characterized by absent or very low ceruloplasmin, low serum copper and iron, high serum ferritin, and iron accumulation in liver, pancreas, and brain, which is highly suggestive of ceruloplasmin defects 1
• Hereditary Hemochromatosis with complicating factors typically presents with atypical laboratory values, including high transferrin saturation and high ferritin, but genetic variants affecting multiple iron metabolism pathways should be considered 2
• A transferrin saturation of 59% exceeds the 55% threshold that suggests increased risk for hemochromatosis and warrants further investigation, as recommended by the American College of Physicians 3
• Early-stage hereditary hemochromatosis can present with elevated transferrin saturation before ferritin rises 3
• Transferrin saturation (TS) is the primary screening test, and a TS > 45% suggests iron overload, which should be confirmed with a second determination (fasting sample advisable but not mandatory) in patients with suspected iron overload 4

Management and Screening

• The American Academy of Medical Genetics recommends iron chelation therapy for Aceruloplasminemia 1
• Screening of siblings for Aceruloplasminemia is recommended, particularly if the condition is diagnosed, according to the National Society of Genetic Counselors 1
• The American College of Physicians recommends testing for HFE gene mutations (C282Y, H63D) as for patients with elevated transferrin saturation 3
• Genetic testing should include testing for mutations in the Transferrin (TF) gene in patients with suspected hypotransferrinemia due to TF gene defects, and the combination of low ferritin with high iron saturation is characteristic of hypotransferrinemia due to TF gene defects 1

Iron Panel and Ferritin Interpretation

• A comprehensive iron panel, including plasma iron, transferrin, transferrin saturation, ferritin, CRP, hepcidin, and evaluation of red blood cell morphology, is recommended by the American College of Nutrition for diagnosing iron deficiency 5
• The following table summarizes ferritin level interpretations:

Treatment and Lifestyle Modifications

• The primary treatment for hemochromatosis is therapeutic phlebotomy, which should be performed weekly until serum ferritin levels reach 50-100 μg/L, followed by maintenance phlebotomy to keep ferritin in this target range, as recommended by the American Association for the Study of Liver Diseases 4
• Remove one unit of blood (450-500 mL) weekly or biweekly, and check hematocrit/hemoglobin before each phlebotomy, allowing hematocrit/hemoglobin to fall by no more than 20% of prior level, as per the American Association for the Study of Liver Diseases guidelines 4
• Deferoxamine (parenteral) may be considered for patients with secondary iron overload due to dyserythropoiesis or those who cannot tolerate phlebotomy, at a dose of 20-40 mg/kg body weight per day, as recommended by the American Association for the Study of Liver Diseases 4
• Iron chelation therapy is indicated when ferritin >1000 ng/mL with evidence of iron overload, transferrin saturation >45%, in transfusion-dependent patients, or in patients with myelodysplastic syndromes with low-risk disease, according to the American Journal of Kidney Diseases, the American Society of Nephrology, and the American Society of Hematology 7, 8, 9
• Avoid iron-fortified foods and limit red meat consumption to prevent iron overload in patients with elevated ferritin levels, as recommended by the American Heart Association with a strength of evidence level of moderate 6
• Consider MRI for liver iron quantification to assess for tissue iron overload, as it is helpful for detection and non-invasive quantification of iron in liver and other organs, and can differentiate between true iron overload and other causes of hyperferritinemia 6
• Weight loss if overweight/obese, limited alcohol intake or abstinence, and avoidance of iron supplements are recommended for patients with elevated ferritin levels, as suggested by the American Journal of Kidney Diseases and the European Association for the Liver 7, 10

Monitoring and Follow-up

• Regular assessment of serum ferritin and transferrin saturation is essential during active treatment, and consider follow-up liver biopsy to confirm adequate iron removal in severe cases, as recommended by the American Association for the Study of Liver Diseases 4
• Monitoring parameters should include TSAT and ferritin levels, which should be checked every 1-3 months during treatment, as recommended by the European Association for the Study of the Liver 11, 6
• Referral to a specialist is recommended when ferritin is >1,000 μg/L or the cause remains unclear after initial evaluation, and primary referral to a gastroenterologist for initial evaluation of hyperferritinemia is recommended, with a strength of evidence level of high, as suggested by the American College of Gastroenterology 6