What serum ferritin level is considered concerning enough to initiate a work‑up for hereditary hemochromatosis?

Ferritin Thresholds for Hemochromatosis Work-Up

A ferritin level >200 µg/L in women or >300 µg/L in men, combined with elevated transferrin saturation (>45% in women, >50% in men), warrants genetic testing for hereditary hemochromatosis in individuals of European ancestry. 1

Sex-Specific Thresholds

The 2022 EASL guidelines provide the most current and authoritative thresholds for initiating hemochromatosis evaluation:

• Women: Ferritin >200 µg/L + transferrin saturation >45%
• Men: Ferritin >300 µg/L + transferrin saturation >50%

These combined criteria should trigger HFE genotyping for the C282Y mutation 1. The guidelines emphasize that both parameters must be elevated—ferritin alone is insufficient given its role as an acute phase reactant and its elevation in numerous other conditions including fatty liver disease, metabolic syndrome, inflammation, and alcohol excess 1.

Critical Context: Transferrin Saturation is Essential

Ferritin cannot be interpreted in isolation. The 2022 EASL guidelines explicitly state that transferrin saturation must be measured concurrently and should be drawn in the morning (though fasting is not required) 1. This dual approach is necessary because:

• Ferritin elevates in inflammation, liver disease, malignancy, and metabolic syndrome
• Transferrin saturation more specifically reflects iron overload
• In confirmed C282Y homozygotes, 84% of men and 73% of women have elevated transferrin saturation 1

When to Suspect Higher Iron Burden

While the above thresholds trigger initial work-up, ferritin >900 µg/L predicts clinically significant iron stores (>4 g in men, >2 g in women among C282Y homozygotes) 2. This higher threshold helps stratify patients who may have more advanced iron accumulation requiring urgent intervention.

Common Pitfalls to Avoid

Do not order genetic testing based on ferritin alone. The 2005 ACP guidelines note that while cutoffs of ferritin >200 µg/L (women) or >300 µg/L (men) with transferrin saturation >55% may be used for case-finding, there is no universal agreement on diagnostic criteria 3. The key error is pursuing hemochromatosis work-up without first confirming elevated transferrin saturation.

Consider alternative diagnoses first in patients with isolated hyperferritinemia, particularly:

• Nonalcoholic fatty liver disease (more common than hemochromatosis) 4
• Alcohol-related liver disease
• Metabolic syndrome
• Inflammatory conditions
• Malignancy

Special Populations

First-degree relatives of confirmed C282Y homozygotes should undergo genetic testing regardless of iron parameters, as penetrance is higher in families with affected individuals 1. Testing should be performed after age 18, as disease penetrance increases with age 1.

Algorithm for Clinical Practice

1. Measure both ferritin AND transferrin saturation in patients with:

   • Unexplained liver enzyme elevation
   • Symptoms suggestive of iron overload (arthralgia, fatigue, diabetes, cardiomyopathy)
   • Family history of hemochromatosis

2. Proceed to HFE genotyping if:

   • Women: Ferritin >200 µg/L AND transferrin saturation >45%
   • Men: Ferritin >300 µg/L AND transferrin saturation >50%

3. Exclude secondary causes if ferritin is elevated but patient is not C282Y homozygote or C282Y/H63D compound heterozygote 4

4. Consider liver biopsy or MRI if ferritin >1,000 ng/mL to assess for advanced fibrosis 4

The 2022 EASL guidelines represent the most current evidence-based approach and should guide contemporary practice over older recommendations 1.