As the hemoglobin goes above 8.4%, estimated average glucose tracks closer to the fasting glucose.

<-- Estimated Average Glucose (mg/dL)

Hemoglobin A1c (%) --> numberscore=(((variable_1)+46.7)/28.7).toFixed(1)

Interpretation --> resultscore1=(((variable_1)+46.7)/28.7);score1>6.4?'Diabetes':score1>5.7?'Impaired Glucose Tolerance':'Normal'

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references:
#1 Rohlfing CL, Wiedmeyer HM, Little RR, England JD, Tennill A, Goldstein DE. Defining the relationship between plasma glucose and HbA(1c): analysis of glucose profiles and HbA(1c) in the Diabetes Control and Complications Trial. Diabetes Care. 2002 Feb;25(2):275-8.
#2 Monnier L, Lapinski H, Colette C. Contributions of fasting and postprandial plasma glucose increments to the overall diurnal hyperglycemia of type 2 diabetic patients: variations with increasing levels of HbA(1c). Diabetes Care. 2003 Mar;26(3):881-5.

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