If a newborn undergoes hemoglobin electrophoresis, what is the typical distribution of Hgb F and Hgb A?

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Multiple Choice

If a newborn undergoes hemoglobin electrophoresis, what is the typical distribution of Hgb F and Hgb A?

In newborns, fetal hemoglobin (HbF) is still the dominant form because gamma-globin production persists after birth while the switch to beta-globin (HbA) happens gradually over time. This means hemoglobin electrophoresis in a healthy newborn shows HbF as the major component, typically about 60–90%, with HbA present but contributing a smaller share, roughly 10–40%. As the infant develops over the first months, HbF declines and HbA increases toward adult levels. The described neonatal pattern—high HbF with a smaller amount of HbA—fits the normal newborn profile.

In newborns, fetal hemoglobin (HbF) is still the dominant form because gamma-globin production persists after birth while the switch to beta-globin (HbA) happens gradually over time. This means hemoglobin electrophoresis in a healthy newborn shows HbF as the major component, typically about 60–90%, with HbA present but contributing a smaller share, roughly 10–40%. As the infant develops over the first months, HbF declines and HbA increases toward adult levels. The described neonatal pattern—high HbF with a smaller amount of HbA—fits the normal newborn profile.

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