† RPG, random plasma glucose is only diagnostic in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis.** For all three prediabetes tests, risk is continuous, extending below the lower limit of the range and becoming disproportionately greater at the higher end of the range.* In the absence of unequivocal hyperglycemia, results should be confirmed by repeat testing.The A1c test should be performed in a laboratory using a method that is NGSP certified and standardized to the DCCT assay.The A1C blood test reflects your average blood glucose levels over the past 3 months. The higher the percentage, the higher your blood glucose levels. The A1C test result is reported as a percentage. The OGTT test should be performed as described by the WHO, using a glucose load containing the equivalent of 75-g anhydrous glucose dissolved in water. The more glucose in your blood, and the longer it stays elevated, the more it will attach to the hemoglobin.Fasting is defined as no caloric intake for at least 8 h.Source (pdf): Standards of Medical Care in Diabetes-2015Ībridged for Primary Care Providers, Table 2, modified to reflect Standards of Medical Care in Diabetes-2018Ĭriteria for the Diagnosis of Prediabetes and Diabetes Test Here are the official ADA diagnostic criteria note the part I have highlighted.
