Variability in the Relationship of Hemoglobin A 1c and Average Glucose Concentrations: How Much Does Race Matter?

Bergenstal and colleagues report a study that contributes to our understanding of racial differences in hemoglobin A_1c (HbA_1c). The editorialists discuss the findings, explain why they do not suggest limited utility of HbA_1c in blacks, and call for studies that enable better understanding of populations that may be prone to discordant HbA_1c and glucose measures.

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