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What are the potential causes for significant discrepancies between predicted A1c by Dexcom CGM and standard serum A1c by lab draw?

I have a longstanding patient with diabetes and a consistently significant difference between CGM average and that predicted by serum A1c. The CGM avg blood glucose is 176 (predicting A1c 7.8%) but the serum A1c is 5.7% predicting avg blood glucose of 117.
1 Answer
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Endocrinology · Banner University Medical Center
Answered on

When interpreting A1C and CGM results, it is important to remember that neither measure is perfect. As in all clinical conditions, it is important to evaluate A1C and CGM results in the context of the clinical situation. If there is a disparity between the two measures, one should review the limitat...

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