Anemia is one of the most common health problems in the world and one of the important clinical markers of the underlying disorder. Prevalence of anemia in preschool children, particularly between 6 months and 5 years (Miller et al, 2003) varies in different countries e.g. 20% of children in the United States and 80% of children in developing countries have anemia (Irwin and Kirchner, 2001). Causes of anemia are many, but with a thorough clinical information and laboratory evaluation, a specific diagnosis can usually be established. The use of the red cell volume (MCV) is a standard...