Evaluation and Management of Elevated Ferritin ≥ 500 ng/mL

Initial Evaluation

Ferritin ≥ 500 ng/mL should trigger immediate measurement of transferrin saturation (TSAT) to distinguish true iron overload from inflammation, because ferritin alone is a nonspecific marker. 1
TSAT ≥ 45 % is the key threshold indicating true iron overload and warrants HFE genotyping; TSAT < 45 % suggests the elevated ferritin most likely reflects inflammation or other non‑iron causes. 3

In the general population, elevated ferritin is more frequently caused by inflammatory, hepatic, neoplastic, or metabolic conditions than by hereditary iron overload. 1
A ferritin level of 500 ng/mL is below the 1000 µg/L threshold that predicts cirrhosis in hereditary hemochromatosis. 1

When TSAT ≥ 45 %, HFE genotyping for the C282Y and H63D mutations should be performed. 3
Homozygous C282Y/C282Y individuals with ferritin < 1000 µg/L and normal transaminases may proceed directly to therapeutic phlebotomy without liver biopsy. 4
Homozygous C282Y/C282Y individuals with ferritin > 1000 µg/L or elevated transaminases should undergo liver biopsy (or MRI) to evaluate hepatic iron concentration and fibrosis. 3
Compound heterozygotes (C282Y/H63D) or non‑C282Y genotypes require liver biopsy or MRI to confirm hepatic iron overload. 3

Induction phase: weekly or twice‑weekly phlebotomy of ~500 mL blood until ferritin falls below 50 µg/L. 4
Maintenance phase: periodic phlebotomy to keep ferritin between 50–100 µg/L. 4
Verify hemoglobin/hematocrit before each phlebotomy and avoid a drop >20 % from baseline. 4
Re‑measure ferritin after every 10–12 phlebotomies. 4
Avoid vitamin C supplementation because it accelerates iron mobilization and increases oxidative stress. 4

Do not initiate phlebotomy or iron chelation; instead treat the underlying inflammatory condition and monitor ferritin and TSAT periodically. [4] [6]

Do not diagnose iron overload based solely on an elevated ferritin without assessing TSAT. 1
Do not start phlebotomy without confirming true iron overload (elevated TSAT and/or confirmed genotype). 3
In homozygous C282Y patients with ferritin > 1000 µg/L, elevated transaminases, and platelet count < 200,000, there is an approximately 80 % probability of cirrhosis. 1

For C282Y homozygotes, a TSAT > 50 % together with ferritin > 300 µg/L in men and post‑menopausal women (or > 200 µg/L in pre‑menopausal women) is sufficient for a provisional diagnosis of hereditary hemochromatosis and to initiate treatment. 6