Likewise, individuals with SCD who carry α-3.7 Kb thalassemia may present laboratory alterations related to increased blood viscosity, such as a higher red blood cell (RBC) count, hemoglobin (Hb), and hematocrit (Hct) concentration, in addition to lower mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC) [15]. The gene discussed is GSTM1; the disease is thalassemia.