Definition: any one of four hemoglobin A fractions (AIa1, AIa2, AIb, or AIc) to which d-glucose and related monosaccharides are covalently linked; concentrations are increased in the erythrocytes of patients with diabetes mellitus, which can be used as a retrospective index of glucose control over time in such patients.
Synonym(s): glycated hemoglobin
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Examples: glitazone, GI cocktail, etc.