What is the HbA1c criterion for diagnosis of type 1 diabetes mellitus (DM)?

Updated: Oct 08, 2021
  • Author: Romesh Khardori, MD, PhD, FACP; Chief Editor: George T Griffing, MD  more...
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Consequently, since 2010 the ADA has included an HbA1c level of 6.5% or higher as a criterion for diabetes diagnosis, with confirmation from repeat testing (unless clinical symptoms are present and the glucose level exceeds 200 mg/dL). HbA1c testing cannot be used in patients with abnormal red blood cell (RBC) turnover (as in hemolytic or iron-deficiency anemia). In children with rapidly evolving type 1 DM, HbA1c may not be significantly elevated despite frank diabetes. [2]

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