HBA2 and hemoglobin H disease: In addition, the HGB (g/L) of patients with HbH-CS disease was lower than that of patients with other types of HbH disease (—SEA/ αWS α,—SEA/- α3.7,—SEA/- α4.2) (80.82 ± 16.43 vs 109.17 ± 14.87, P = 0.000).