Table 2.
| Diagnosis | ADA criteria |
| Diabetes | FPG ≥ 126 mg/dL (7.0 mmol/L). Fasting is defined as no caloric intake for at least 8 h.1 OR |
| 2-h PG ≥ 200 mg/dL (11.1 mmol/L) during OGTT. The test should be performed as described by the WHO, using a glucose load containing the equivalent of 75-g anhydrous glucose dissolved in water.1 OR | |
| A1C ≥ 6.5% (48 mmol/mol). The test should be performed in a laboratory using a method that is NGSP certified and standardized to the DCCT assay.1 OR | |
| in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis, an RPG ≥ 200 mg/dL (11.1 mmol/L). | |
| Prediabetes | FPG 5.6-6.9 mmol/L (100-125mg/dL) (IFG) OR |
| 2HPG 7.8-11.0 mmol/L(IGT) OR | |
| A1c 5.7%-6.4% |
In the absence of unequivocal hyperglycemia, diagnosis requires two abnormal test results from the same sample or in two separate test samples. ADA: American Diabetes Association; RPG: Random plasma glucose: refers to the blood glucose level at any time regardless of the time of the last meal in 1 d; FPG: Fasting plasma glucose; OGTT: Oral glucose tolerance test; 2HPG is the blood glucose level 2 h after OGTT; HbA1c is glycosylated hemoglobin; the symptoms of diabetes mellitus include polyuria, polydipsia and unexplained weight loss. Intravenous blood glucose levels must be measured on the next day once the blood glucose level is detected abnormal to confirm the diagnosis. Hyperglycemia caused by specific acute metabolic abnormalities must be excluded; DCCT assay: Diabetes Control and Complications Trial assay.