β0-thal: HbA1 is zero, HbF is very high > 90%, HbA2 > 4% 6 β+-thal: HbF, HbA2 > 4%, HbA1 severely reduces.
β 0 - thal: HbA1 bằng 0, HbF tăng rất cao > 90%, HbA2 > 4% β + - thal: HbF, HbA2 > 4%, HbA1 giảm nặng.