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Study examines efficacy of A1C in classifying adults with type 2 diabetes

Mexican researchers found that A1C is "not the optimal tool" to diagnose type 2 diabetes or prediabetes, with A1C assays identifying more participants with the diseases than oral glucose tolerance testing. The findings in the Journal of the Endocrine Society, based on 854 adults without known diabetes at baseline participating in the Mexico City Diabetes Study, revealed that 81 were diagnosed with type 2 diabetes via OGTT when using fasting glucose as the only diagnostic criterion, compared with 451 via A1C levels.

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