Screening and Management of Hemochromatosis

Screening Recommendations

The American College of Physicians recommends routine population-wide screening for hereditary hemochromatosis is not recommended, but targeted screening should be performed in high-risk individuals using transferrin saturation and serum ferritin as initial tests, followed by HFE genetic testing when indicated 1, 2, 3
First-degree relatives of patients with hereditary hemochromatosis should undergo screening with both phenotypic testing (transferrin saturation and ferritin) and HFE genotyping 4
Case-finding is recommended for individuals with suggestive symptoms, clinical findings, or associated conditions, with the highest yield for optional screening being one-time phenotypic screening of asymptomatic non-Hispanic white men 1, 2

Both transferrin saturation and serum ferritin should be obtained simultaneously rather than relying on a single test, with diagnostic thresholds of transferrin saturation ≥45% and serum ferritin >300 μg/L in men or >200 μg/L in women 2, 3, 4
HFE genetic testing should be performed for C282Y and H63D mutations, with interpretation of results guiding further evaluation and management 4, 5, 6

Therapeutic phlebotomy is the mainstay of treatment for confirmed hemochromatosis with iron overload, with monitoring of serum ferritin levels and transferrin saturation during treatment 4
Family screening should be recommended for all first-degree relatives of an identified proband, with testing of the other parent recommended for children of a proband 4

Genetic counseling should be provided before genetic testing, discussing benefits, risks, costs, and social implications 2, 3
Serum ferritin can be falsely elevated due to inflammation, liver disease, or other conditions unrelated to iron overload 5

The European Association for the Study of the Liver (EASL) recommends that all adult first-degree relatives of a patient diagnosed with hemochromatosis should undergo both HFE genetic testing for the C282Y mutation and simultaneous phenotypic screening with transferrin saturation and serum ferritin 7
Performing both genetic and phenotypic testing simultaneously is recommended, rather than one or the other, for first-degree relatives of patients with hemochromatosis 7
The yield of screening is particularly high in siblings, with 33% showing C282Y homozygosity compared to 23% of all first-degree relatives 8, 9

The European Association for the Study of the Liver (EASL) emphasizes that genotyping should be combined with biochemical assessment because homozygosity for C282Y alone is neither necessary nor sufficient for the diagnosis of hemochromatosis 7
Penetrance in family members is higher than in the general population, making screening more cost-effective 7

Adult individuals of European ancestry with a positive family history of first-degree relatives with hemochromatosis should undergo genetic testing for hemochromatosis after obtaining informed consent, according to the most recent international guidelines applicable to Canadian practice 10
First-degree relatives (parents, siblings, children) of patients with confirmed hemochromatosis should receive both HFE genetic testing and simultaneous phenotypic screening (transferrin saturation and serum ferritin) 10, 11

Testing should focus on the C282Y mutation in the HFE gene, as this accounts for 85-90% of clinically affected patients of European origin 11
The C282Y variant is by far the most common genetic cause in individuals of European origin, with homozygosity (C282Y/C282Y) present in over 80% of patients with clinically overt hemochromatosis 11

Males with transferrin saturation >50% and/or ferritin >300 μg/L should proceed with genetic testing 12
Females with transferrin saturation >45% and/or ferritin >200 μg/L should proceed with genetic testing 12
Either sex with persistently elevated transferrin saturation (≥45%) should proceed with genetic testing 10, 12

Genetic testing is indicated for clinical and biochemical signs of hemochromatosis with elevated transferrin saturation and high serum ferritin 10
Genetic testing is indicated for unexplained persistently elevated transferrin saturation 10
Genetic testing is indicated for increased liver iron evident on liver biopsy or MRI (after biochemical assessment) 10

Exclude secondary causes of hyperferritinemia before attributing elevated iron studies to hemochromatosis, including chronic alcohol consumption 12, non-alcoholic fatty liver disease 10, and metabolic syndrome 10
Penetrance is variable, with only 50% of C282Y homozygotes developing end-organ damage in population-based studies, with higher penetrance in males and increasing with age 12