from Section II - Non-Neoplastic Hematologic Disorders of Blood and Bone Marrow
Published online by Cambridge University Press: 25 January 2024
Anemia is defined as a hemoglobin (Hb) level or red blood cell (RBC) mass of less than the 5th percentile for age [1]. Approximately 20% of American children have anemia [1]. Most children with anemia are asymptomatic, and the condition is often discovered incidentally on routine laboratory testing.
Hemoglobin is a tetrameric protein composed of two pairs of globin chains complexed with four heme groups and is responsible for the transportation of oxygen of RBCs [2,3]. Normal adult RBCs contain 97% hemoglobin A (HbA; α2β2), 2% HbA2 (α2δ2), and 1% fetal Hb (HbF; α2γ2). At birth, HbF is predominant. Within the first year of life, it is largely replaced by HbA [3].
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