HBA2 and thalassemia: According to AUC (0.5-0.7, low efficiency; 0.7-0.9, moderate efficiency; > 0.9, high efficiency), RBC was better for screening α-thalassemia carriers while RBC (AUC 0.868), RDW-CV (AUC 0.896), HbA2 (AUC 0.966), and HbF (AUC 0.828) had better efficiency for screening β-thalassemia minor carriers.