The serum ferritin (ng/ml) of patients with HbH-CS disease was higher than that of patients with other types of HbH disease (—SEA/ αWS α,—SEA/- α3.7,—SEA/- α4.2) (833.51 ± 1334.56 vs 497.40 ± 372.10, P = 0.552), but it was not statistically significant. Here, HBA2 is linked to hemoglobin H disease.