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Classification of HH
| Type | Gene | Gene Location |
|---|---|---|
| 1 (classical HH) | HFE | 6p21.3 |
| 2a | HJV | 1p21 |
| 2b | HAMP | 19q13 |
| 3 | TFR2 | 7q22 |
| Ferroportin disease (formerly type 4A) | SLC40A1 | 2q32.2 |
| 4 (formerly type 4B) | SLC40A1 | 2q32.2 |
Abbreviation: SLC40A1, solute carrier family 40 member 1.
