Table 2.
Distribution of hemoglobin fractions presented in 169 α-thalassemia fetuses (%).
| Genotype | N (cases) | HbF | HbA | HbA2 | Hb Barts | Hb CS | HbF variant | Hb Portland | Hb Epsilon4 | Hb Gower1 | HbH | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| α-thalassemia | α-thalassemia silent carrier (one alpha-gene defect) | 15 | 91.49 ± 3.01 | 7.74 ± 2.69 | 0.1 (1 case) | 0.81 ± 0.66 | – | – | – | – | – | – |
| α-thalassemia trait (two alpha-gene defects) | 31 | 83.75 ± 9.88 | 9.46 ± 3.71 | 0.3 ± 0.08 (4 cases) | 4.71 ± 2.81 | 1.10–2.50 (2 cases) | 5.70–54.90 (2 cases) | 1.30 (1 case) | – | – | – | |
| α-thalassemia intermedia (three alpha-gene defects) | 21 | 61.76 ± 10.13 | 11.62 ± 3.46 | 0.20–0.40 (2 cases) | 23.52 ± 5.63 | 1.50 ± 0.56 (4 cases) | 46.20 (1 case) | 0.74 ± 0.17 (10 cases) | 0.52 ± 0.17 (9 cases) | – | 0.20 | |
| α-thalassemia major (four alpha-gene defects) | 102 | – | – | – | 86.02 ± 3.79 | – | 12.33 ± 1.72 (3 cases) | 11.67 ± 3.0 | 1.55 ± 0.21 (39 cases) | 4.20 ± 2.15 (39 cases) | 0.91 ± 0.44 (26 cases) |