What is the most likely cause and recommended work‑up and management for a patient with serum iron 211 µg/dL and transferrin saturation 100%?

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Last updated: September 12, 2026 • View editorial policy

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Immediate Work-Up for Hereditary Hemochromatosis

This patient has severe iron overload with 100% transferrin saturation and markedly elevated serum iron, requiring immediate HFE genetic testing for hereditary hemochromatosis, hepatic MRI to quantify tissue iron burden, and assessment for end-organ damage. 1

Most Likely Diagnosis

With transferrin saturation of 100% and serum iron of 211 µg/dL, hereditary hemochromatosis (particularly HFE-related) is the primary concern. The 2022 EASL guidelines specify that males with transferrin saturation >50% and females with >45% warrant HFE genotyping 1. Your patient's 100% saturation far exceeds these thresholds, indicating severe disruption of the hepcidin-ferroportin axis 2.

Immediate Diagnostic Algorithm

First-Line Testing (Order Now):

  • HFE genotyping for p.C282Y mutation - This is the single most important test, as p.C282Y homozygosity accounts for the vast majority of clinically significant hereditary hemochromatosis in patients of European descent 1
  • Complete iron panel: Confirm transferrin saturation calculation, measure serum ferritin (expect >300 µg/L in males, >200 µg/L in females) 1
  • Hepatic MRI with R2 sequences* to quantify liver iron concentration - This is mandatory per EASL guidelines for patients with biochemical iron overload 1

Second-Line Assessment:

  • Liver function tests and assessment for cirrhosis: Check AST, ALT, albumin, INR, and consider liver elastography if ferritin >1000 ng/mL 3
  • Cardiac MRI if any signs of heart disease (arrhythmias, heart failure symptoms, abnormal ECG) 1
  • Fasting glucose and HbA1c - Iron overload affects pancreatic beta cells
  • Screen for hepatocellular carcinoma with ultrasound and AFP if cirrhosis suspected

Critical Exclusions Before Confirming Diagnosis

Rule out secondary causes that can elevate transferrin saturation 4, 5:

  • Recent intravenous iron administration - Can cause transient "oversaturation" >100% 6
  • Acute hepatocellular injury - Check AST/ALT
  • Hemolysis - Check LDH, haptoglobin, peripheral smear
  • Alcohol consumption - Detailed history essential
  • Metabolic syndrome - Though this typically causes elevated ferritin with normal-to-low transferrin saturation

Management Pending Results

Do NOT wait for genetic results to begin treatment if clinical iron overload is confirmed. The 2022 EASL guidelines support initiating therapeutic phlebotomy in patients with clear biochemical and radiologic evidence of iron overload 1.

Phlebotomy Protocol:

  • Remove 500 mL blood weekly initially
  • Target ferritin 50-100 µg/L
  • Monitor hemoglobin before each session
  • Once de-ironed, maintain with phlebotomy every 2-4 months

Lifestyle Modifications (Critical):

  • Absolutely avoid raw or undercooked seafood - Patients with hemochromatosis have >50% mortality from Vibrio vulnificus sepsis due to siderophilic bacterial growth in high-iron environments 1
  • Avoid iron supplements and high-dose vitamin C
  • Limit alcohol consumption (increases fibrosis risk)
  • Address metabolic syndrome components if present

Genetic Counseling Considerations

If p.C282Y homozygosity is confirmed 1:

  • All first-degree adult relatives (>18 years) require HFE genotyping
  • Siblings have 25% chance of being homozygous
  • Children should be tested if spouse is also a carrier or in consanguineous relationships

Common Pitfalls to Avoid

  1. Delaying treatment while awaiting genetics - Begin phlebotomy if MRI confirms tissue iron overload
  2. Assuming elevated ferritin alone indicates iron overload - Ferritin is an acute-phase reactant; transferrin saturation is the key discriminator 2, 5
  3. Missing compound heterozygotes - If only p.C282Y heterozygous, test for p.H63D; compound heterozygotes (C282Y/H63D) can develop mild-to-moderate iron overload, especially with cofactors 1
  4. Overlooking cardiac involvement - Cardiac iron deposition can cause life-threatening arrhythmias and cardiomyopathy 1

If Genetic Testing is Negative

Consider rare causes 7:

  • Aceruloplasminemia (check ceruloplasmin, copper)
  • Transferrin deficiency (low transferrin with high ferritin)
  • SLC11A2 defects (though these typically cause microcytic anemia)
  • Refer to specialized iron overload center for expanded genetic panel

References

4
Research

Investigation of a raised ferritin-hereditary haemochromatosis or not?

QJM : monthly journal of the Association of Physicians, 2026

5
Research

Non-invasive diagnosis and follow-up of hyperferritinaemia.

Clinics and research in hepatology and gastroenterology, 2022

6
Research

'Oversaturation' of transferrin after intravenous ferric gluconate (Ferrlecit(R)) in haemodialysis patients.

Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association, 1996

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