Common thalassemia syndromes in Thailand.
| . | Genotype . | Phenotype . |
|---|---|---|
| α- thalassemia | ||
| - - / α α | Heterozygous α-thalassemia 1 | Thalassemia minor |
| - α / α α | Heterozygous α-thalassemia 2 | Silent carrier |
| - - / - - | Homozygous α-thalassemia 1 | Hb Bart's hydrops fetalis |
| - α /-α | Homozygous α-thalassemia 2 | Thalassemia minor |
| - - / -α | α-thalassemia 1/α-thalassemia 2 | Hb H disease |
| - - /αcs α | α-thalassemia 1/Hb Constant Spring | Hb H disease |
| β-thalassemia | ||
| Heterozygous β0-thalassemia | Thalassemia minor | |
| Heterozygous β+ -thalassemia | Thalassemia minor | |
| Homozygous β0 -thalassemia | Thalassemia major | |
| β0 -thalassemia /β+-thalassemia | Thalassemia intermedia | |
| HbE β0-thalassemia | Thalassemia intermedia or thalassemia major | |
| HbE β+-thalassemia | Thalassemia intermedia | |
| . | Genotype . | Phenotype . |
|---|---|---|
| α- thalassemia | ||
| - - / α α | Heterozygous α-thalassemia 1 | Thalassemia minor |
| - α / α α | Heterozygous α-thalassemia 2 | Silent carrier |
| - - / - - | Homozygous α-thalassemia 1 | Hb Bart's hydrops fetalis |
| - α /-α | Homozygous α-thalassemia 2 | Thalassemia minor |
| - - / -α | α-thalassemia 1/α-thalassemia 2 | Hb H disease |
| - - /αcs α | α-thalassemia 1/Hb Constant Spring | Hb H disease |
| β-thalassemia | ||
| Heterozygous β0-thalassemia | Thalassemia minor | |
| Heterozygous β+ -thalassemia | Thalassemia minor | |
| Homozygous β0 -thalassemia | Thalassemia major | |
| β0 -thalassemia /β+-thalassemia | Thalassemia intermedia | |
| HbE β0-thalassemia | Thalassemia intermedia or thalassemia major | |
| HbE β+-thalassemia | Thalassemia intermedia | |