NCIt definition : A mild form of sickle cell thalassemia characterized by the presence of hemoglobin
S and a small amount of hemoglobin A in the red blood cells. It is characterized by
the presence of small red blood cells and mild anemia.;
Alternative definition : NICHD: A mild form of sickle cell thalassemia characterized by the presence of hemoglobin
S and a small amount of hemoglobin A in the erythrocytes. It is characterized by the
presence of small erythrocytes and milder clinical phenotype.;