There are initial tests to evaluate anemia that have been widely accepted, such as Hb level, platelet count, RBC indices, white blood count (WBC), differential cell count (DLC), mean corpuscular volume (MCV), absolute reticulocyte count, serum iron studies, transferrin saturation (TSAT), serum ferritin, and hepcidin [40]. This evidence concerns the gene GSTM1 and anemia.