Table 3. Criteria for the Diagnosis of Diabetes
Test Comments
A1c ≥6.5% e test should be performed in a laboratory using a
method that is National Glycohemoglobin Standard-
ization Program (NGSP) certified and standardized
to the Diabetes Control and Complications Trial
(DCCT) assay.
a
FPG ≥126 mg/dL
(7.0 mmol/L)
Fasting is defined as no caloric intake for at least 8 h.
a
2-h plasma glucose
≥200 mg/dL
(11.1 mmol/L) dur-
ing an OGTT
e 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
Random plasma glu-
cose ≥200 mg/dL
(11.1 mmol/L)
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 2. Categories of Increased Risk for Diabetes
(Prediabetes)
a
Test Parameters
Impaired fasting
glucose (IFG)
Fasting plasma glucose (FPG) 100-125 mg/dL
(5.6-6.9 mmol/L)
Impaired glucose
tolerance (IGT)
2-h plasma glucose in the 75-g oral glucose tolerance
test (OGTT) 140-199 mg/dL (7.8-11.0 mmol/L)
A1c 5.7%-6.4%
a
For all three tests, risk is continuous, extending below the lower limit of the range and becoming
disproportionately greater at higher ends of the range.
Diagnosis and Assessment
2
