Hemoglobin S results from replacement of glutamic acid, a hydrophilic amino acid by valine that is hydrophobic, at position 6 of the b-globin chain of hemoglobin moiety.1 Children with sickle cell anemia (SCA) experience significant medical and psychosocial burdens.1 They frequently have crises such as recurrent bone pains, anemia, infections, and end-organ damage. The disorder is one of the most common hereditary disorders among the black population of the world.2 In Nigeria, where about 150,000 children are born with the disease annually, the prevalence ranged between20and30per1000livebirths.2 Severityofthedisease is commonly measured with some clinical and laboratory parameters such as frequency and severity of painful episodes, frequency of hospitalization and blood transfusion, and presence of hepatosplenomegaly and jaundice.1,2