6/21/2023 0 Comments Pregnancy Hb-Thl by Cathie Cush![]() ![]() The switch from fetal Hb (HbF) to adult Hb (HbA) occurs at approximately 3–6 months after birth. The other two types of hemoglobin are minor fractions containing fetal Hb (HbF) and hemoglobin A2 (HbA2). Genes for all four globin chains are located on chromosomes 11 and 16 and are inherited – half are maternal and half are paternal. There are two genes for the two β-globin chains (one gene for each β-globin chain) and four genes for the two α-globin chains (two genes for each α-globin chain). Hemoglobin A consists of four main globin chains (two beta (β) and two alpha (α) chains: β2α2). Normal adult red blood cells contain three types of hemoglobin (Hb) with the main component being hemoglobin A (HbA). See end of chapter for details INTRODUCTION By completing 4 multiple-choice questions (randomly selected) after studying this chapter readers can qualify for Continuing Professional Development awards from FIGO plus a Study Completion Certificate from GLOWM ![]()
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