Table 6. Criteria for the Diagnosis of Diabetes Test
Comments
(at least one of these tests) A1c ≥ 6.5%
FPG ≥ 126 mg/dL (7.0 mmol/L)
2-h plasma glucose ≥ 200 mg/dL (11.1 mmol/L) during an OGTT
Random plasma glucose ≥ 200 mg/dL (11.1 mmol/L)
The test should be performed in a laboratory using a method that is National Glycohemoglobin Standardization Program (NGSP) certified and standardized to the Diabetes Control and Complications Trial (DCCT) assay.a
Fasting is defined as no caloric intake for at least 8 h.a
The test should be performed as described by the World Health Organization, using a glucose load containing the equivalent of 75 g anhydrous glucose dissolved in water.a
In a patient with classic symptoms of hyperglycemia or hyperglycemic crisis.a
a In the absence of unequivocal hyperglycemia, result should be confirmed by repeat testing.
Table 7. Correlation of A1c with Average Glucose Mean Plasma Glucose
A1c (%) 6 7 8 9
10 11 12
mg/dL 126 154 183 212 240 269 298
mmol/L 7.0 8.6
10.2 11.8 13.4 14.9 16.5
3
