HBA2 and beta thalassemia: Table 3 shows the laboratory parameters among the participants positive for HbA2, where the red blood cell (RBC) count was found to be higher in the beta thalassemia trait (BTT) group with low mean corpuscular hemoglobin (MCH), red cell distribution width (RDW)%, red cell distribution width index (RDWI), and Mentzer index (MI).