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Categories of HH [11]
| Category 1 | Genetic mutation only (C282Y homozygotes, H63D heterozygotes and compound heterozygotes) |
| Category 2 | Genetic mutation and elevated iron studies, either transferrin saturation or serum iron |
| Category 3 | Genetic mutation, elevated iron levels and early symptoms, including arthritis, fatigue |
| Category 4 | Genetic mutation, elevated iron levels and organ damage |
