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How is Diabetes Diagnosed? 

Criteria for Diagnosis of Diabetes*

  1. Fasting plasma glucose ≥ 126 mg/dl   -or-
  2. 2-hr plasma glucose ≥ 200 mg/dl post 75g oral glucose challenge  -or-
  3. Random plasma glucose ≥ 200 mg/dl with symptoms  -or-
  4. A1C ≥ 6.5%

*For criteria 1-3: Repeat test to confirm unless symptoms are present. It is preferable that the same test be repeated for confirmation. If two different tests are used (ie: FPG & A1C) and both indicate diabetes, consider the diagnosis confirmed, but if the two different tests are discordant, repeat the test above the diagnostic cut point.

Criteria for Pre-diabetes**

  1. Fasting plasma glucose 100 - 125 mg/dl  -or-
  2. 2-hr post 75g oral glucose challenge 140 - 199 mg/dl  -or-
  3. A1C 5.7% - 6.4%

**For all tests, risk of diabetes is continuous, extending below the lower limit of the range and becoming disproportionately greater at higher ends of the range.

For more information about the diagnosis of diabetes, click on the following link:
http://ndep.nih.gov/media/numatglance_eng.pdf

 

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