Which criteria support the diagnosis of type 2 diabetes mellitus (DM) rather than gestational diabetes mellitus (GDM)?

Updated: Apr 29, 2020
  • Author: Thomas R Moore, MD; Chief Editor: George T Griffing, MD  more...
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According to the American Diabetes Association "Standards of Medical Care in Diabetes--2010," [6, 7] the presence of any one of the following criteria supports the diagnosis of diabetes mellitus:

  • HbA1C = 6.5%

  • FPG greater than 126 mg/dL (7.0 mmol/L); fasting is defined as no caloric intake for at least 8 hours

  • A 2-hour plasma glucose level = 200 mg/dL (11.1 mmol/L) during a 75-g OGTT

  • A random plasma glucose level = 200 mg/dL (11.1 mmol/l) in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis

In the absence of unequivocal hyperglycemia, a diagnosis based on any of the first 3 of the above criteria should be confirmed by repeat testing on a different day.

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