What are the common causes of hyperferritinemia?

Common Causes of Hyperferritinemia

Over 90% of elevated ferritin cases are caused by inflammation, chronic liver disease, metabolic syndrome, chronic alcohol consumption, cell necrosis, tumors, and infections—not iron overload. 1, 2

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Understanding Ferritin as a Biomarker

Ferritin is an acute-phase reactant that rises during inflammation, infection, hepatocellular injury, and tissue necrosis completely independent of actual iron stores. 1, 2 This means that an elevated ferritin level does not automatically indicate iron overload; in fact, in the general population, iron overload is not the most common cause of elevated ferritin. 1

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Primary Categories of Elevated Ferritin

1. Inflammatory & Infectious Conditions

• Chronic inflammatory diseases (rheumatoid arthritis, inflammatory bowel disease, systemic lupus) elevate ferritin as part of the acute-phase response. 1, 2
• Active infections (bacterial, viral, fungal) cause ferritin to rise acutely; infection drives ferritin elevation, not the reverse. 1
• Adult-onset Still's disease produces extreme hyperferritinemia (4,000–30,000 ng/mL, occasionally up to 250,000 ng/mL) with glycosylated ferritin fraction <20%, which is 93% specific for this diagnosis. 1
• Hemophagocytic lymphohistiocytosis/macrophage activation syndrome presents with ferritin >5,000–10,000 ng/mL, persistent fever, cytopenias, splenomegaly, elevated triglycerides, and multiorgan dysfunction. 1, 3, 4, 5
• Systemic inflammatory response syndrome is a recognized cause of hyperferritinemia. 1

2. Liver Disease

• Chronic alcohol consumption increases intestinal iron absorption and causes hepatocellular injury, leading to elevated ferritin. 1, 2
• Non-alcoholic fatty liver disease (NAFLD)/metabolic syndrome causes ferritin elevation that reflects hepatocellular injury and insulin resistance rather than true iron overload. 1, 2
• Viral hepatitis (hepatitis B and C) produces elevated ferritin in approximately 50% of patients due to hepatic inflammation. 1
• Acute hepatitis and cirrhosis are associated with elevated ferritin levels. 1
• Alcoholic liver disease is a common cause of hyperferritinemia. 1

3. Malignancy

• Solid tumors elevate ferritin as a tumor marker. 1
• Lymphomas are associated with hyperferritinemia. 1
• Hepatocellular carcinoma can cause elevated ferritin. 1
• In one large series, malignancy was the most frequent condition associated with ferritin >1,000 μg/L (153/627 cases, average ferritin 2,647 μg/L). 3

4. Cell Necrosis & Tissue Damage

• Cell necrosis from muscle injury, hepatocellular necrosis, or tissue breakdown releases ferritin from lysed cells independent of iron stores. 1, 2
• Ferritin is released directly from necrotic or damaged cells. 1

5. Iron Overload Disorders (Less Common)

• Hereditary hemochromatosis (HFE-related) is characterized by C282Y homozygosity or C282Y/H63D compound heterozygosity and accounts for >80% of clinically overt hemochromatosis cases. 1, 2
• Non-HFE hemochromatosis results from mutations in TFR2, SLC40A1, HAMP, or HJV genes. 1, 2, 6
• Ferroportin disease (hemochromatosis type 4a) causes hyperferritinemia without proportionate iron overload. 6, 7
• Hereditary hyperferritinemia-cataract syndrome (HHCS) results from mutations in the L-ferritin gene (FTL) on chromosome 19, causing isolated hyperferritinemia without iron overload and early-onset cataracts. 7
• In one large series, iron-overload syndromes were the second most common cause (136/627 cases). 3

6. Chronic Kidney Disease

• Chronic kidney disease with anemia may show elevated ferritin (500–1,200 ng/mL) with low transferrin saturation (<25%), representing functional iron deficiency despite elevated ferritin. 1, 2

7. Other Conditions

• Diabetes mellitus is associated with elevated ferritin. 1
• Chronic transfusion was the most common cause of extreme hyperferritinemia (>10,000 ng/mL) in one series, accounting for 35% of cases. 4

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Critical Diagnostic Algorithm

Step 1: Measure Transferrin Saturation Simultaneously

Always measure fasting transferrin saturation (TS) alongside ferritin to distinguish true iron overload from secondary causes. 1, 2 Ferritin alone has high sensitivity but low specificity for iron overload. 1

• If TS ≥45%: Suspect primary iron overload and proceed immediately to HFE genetic testing for C282Y and H63D mutations. 1, 2
• **If TS <45%:** Iron overload is unlikely (>90% certainty); evaluate secondary causes such as inflammation, liver disease, malignancy, infection, and metabolic syndrome. 1, 2

Step 2: Risk Stratification by Ferritin Level

Ferritin Level	Clinical Significance	Action Required
<1,000 μg/L	Low risk of organ damage; 94% negative predictive value for advanced fibrosis. [1,2]	Evaluate secondary causes if TS <45%.
1,000–10,000 μg/L	Higher risk of advanced fibrosis/cirrhosis if iron overload present; in C282Y homozygotes, ferritin >1,000 μg/L + elevated aminotransferases + platelets <200,000/μL predicts cirrhosis in ~80% of cases. [1,2]	Consider liver biopsy if TS ≥45% with elevated liver enzymes or thrombocytopenia. [1]
>10,000 μg/L	Rarely due to simple iron overload; mandates urgent specialist referral to evaluate for life-threatening conditions (HLH, macrophage activation syndrome, adult-onset Still's disease). [1,2,4,5]	Urgent hematology/rheumatology referral.

Step 3: Evaluate Secondary Causes When TS <45%

• Check inflammatory markers: CRP, ESR to detect occult inflammation. 1
• Assess liver function: ALT, AST, complete metabolic panel, abdominal ultrasound to evaluate for fatty liver, chronic liver disease, or hepatomegaly. 1
• Screen for malignancy: CBC with differential, peripheral smear, consider CT imaging if B symptoms or lymphadenopathy present. 1
• Evaluate for infection: Blood cultures, viral serologies if clinically indicated. 1
• Assess alcohol consumption: Detailed history of alcohol use. 1
• Check for muscle injury: Creatine kinase (CK) to evaluate for rhabdomyolysis or muscle necrosis. 1

Step 4: Special Considerations for Extreme Hyperferritinemia

• If ferritin >4,000–5,000 ng/mL with persistent fever: Consider adult-onset Still's disease and measure glycosylated ferritin fraction (<20% is 93% specific for AOSD). 1, 2
• If ferritin >5,000–10,000 ng/mL with cytopenias, fever, splenomegaly: Screen for hemophagocytic lymphohistiocytosis/macrophage activation syndrome (check triglycerides, fibrinogen, soluble IL-2 receptor, bone marrow for hemophagocytosis). 1, 5
• A ferritin cutoff of 6,000 μg/L is significantly associated with HLH diagnosis and increased mortality. 5

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Common Pitfalls to Avoid

• Never use ferritin alone to diagnose iron overload—transferrin saturation must be measured simultaneously. 1, 2
• Do not assume iron overload when TS <45%—over 90% of cases are due to secondary causes. 1, 2
• Do not overlook liver biopsy in patients with ferritin >1,000 μg/L and abnormal liver tests, as this combination warrants histologic assessment for cirrhosis. 1
• Recognize that extremely high ferritin (>10,000 μg/L) rarely represents simple iron overload—it usually indicates hematologic malignancy, chronic transfusion, severe infection, or HLH. 1, 4