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ADA diabetes diagnosis guidelines 2015

American Diabetes Association (ADA) Guidelines: Criteria for Diabetes Diagnosis

The American Diabetes Association's (ADA's) updated 2015 guidelines include recommendations for screening and criteria for the diagnosis of diabetes. 
The ADA recommends using these 4 criteria for diabetes diagnosis (4 testing options):
  1. Hemoglobin A1C ≥6.5%* - Perform in laboratory using National Glycohemoglobin Standardization Program (NGSP)-certified method and standardized to the Diabetes Control and Complications Trial (DCCT) assay.
  2. Fasting plasma glucose  (FPG) ≥126 mg/dL (7.0 mmol/L)* -  Fasting defined as no caloric intake for ≥8 hours.
  3. 2-hour plasma glucose (PG) ≥200 mg/dL (11.1 mmol/L) during oral glucose tolerance test (OGTT) (75-g)* - Performed as described by the World Health Organization (WHO), using glucose load containing the equlivalent of 75 g anhydrous glucose dissolved in water. 
  4. Random plasma glucose (PG) ≥200 mg/dL (11.1 mmol/L) - In persons with symptoms of hyperglycemia or hyperglycemic crisis.
In the absence of unequivocal hyperglycemia results should be confirmed using repeat testing.
Unless clinical diagnosis is clear, same test to be repeated using a new blood sample for confirmation.
Two discordant results? Result above cutpoint should be repeated.
Source: Diabetes management guidelines (2015). National Diabetes Education Initiative web site. Available at: http://www.ndei.org/ADA-diabetes-management-guidelines-diagnosis-A1C-testing.aspx. Accessed February 17, 2016.