What is the main type of hemoglobin in fetus and newborn babies?

Prepare for the AAB Medical Technologist (MT) Generalist Exam with flashcards and multiple choice questions. Each question includes hints and explanations to boost your understanding. Get exam-ready now!

The main type of hemoglobin present in fetuses and newborn babies is Hemoglobin F, also known as fetal hemoglobin. It plays a crucial role during gestation as it has a higher affinity for oxygen compared to adult hemoglobin (Hemoglobin A). This property allows the fetus to effectively extract oxygen from the maternal blood across the placenta, ensuring that the developing fetus receives adequate oxygen supply despite lower oxygen levels in the maternal circulation.

Hemoglobin F makes up a significant portion of the hemoglobin in a newborn, typically comprising about 60-80% of total hemoglobin at birth, and it gradually decreases after birth as Hemoglobin A becomes more dominant. This transition is a normal part of development as the newborn adapts to breathing air and no longer relies on placental oxygen transfer.

Understanding the role of Hemoglobin F is important for recognizing normal physiology in newborns and for assessing potential hemoglobinopathies or other conditions related to abnormal hemoglobin types in later life.

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