In a healthy adult, what is the typical distribution of major hemoglobins?

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Multiple Choice

In a healthy adult, what is the typical distribution of major hemoglobins?

In a healthy adult, hemoglobin is dominated by HbA, with small, stable amounts of HbA2 and a very low level of HbF. The usual pattern is HbA making up about 95–98% of total hemoglobin, HbA2 roughly 2–3%, and HbF typically less than about 1–2%. This reflects the normal switch from fetal to adult hemoglobin after birth. The distribution described—HbA over 95%, HbA2 under 3.5%, and HbF under 2%—fits these typical adult values, making it the correct match. Patterns with unusually high HbF (for example, over 20%), or very low HbA with still-low HbA2, would indicate a abnormality or a neonatal/persistent fetal pattern, not a healthy adult.

In a healthy adult, hemoglobin is dominated by HbA, with small, stable amounts of HbA2 and a very low level of HbF. The usual pattern is HbA making up about 95–98% of total hemoglobin, HbA2 roughly 2–3%, and HbF typically less than about 1–2%. This reflects the normal switch from fetal to adult hemoglobin after birth.

The distribution described—HbA over 95%, HbA2 under 3.5%, and HbF under 2%—fits these typical adult values, making it the correct match. Patterns with unusually high HbF (for example, over 20%), or very low HbA with still-low HbA2, would indicate a abnormality or a neonatal/persistent fetal pattern, not a healthy adult.

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