Which of the following is a G-Hgb fraction?

The G-Hgb fraction refers specifically to glycosylated hemoglobin forms, which are hemoglobin molecules that have glucose attached to them. Hemoglobin A1c is the most recognized G-Hgb fraction and is widely used to assess long-term glucose control in individuals with diabetes. It reflects the average blood glucose levels over several months.

Other fractions mentioned, such as A2b, A3c, or A4d, do not correspond to established G-Hgb fractions used clinically for monitoring glycemic control. Hemoglobin A2 and other specified fractions are related to different types of hemoglobin variations but are not defined as glycosylated forms. This distinction is crucial in the context of diabetes care and monitoring, emphasizing why A1c is the appropriate choice representing a G-Hgb fraction.