How is prediabetes detected?
At present, the fasting plasma glucose (FPG) and the 2-h oral glucose tolerance test (OGTT) are the tests of choice to identify all states of hyperglycemia. Either test is suitable, and each has advantages and disadvantages, such as convenience, cost, and reproducibility. Identification of individuals with IGT can be made only with a 2-hour OGTT; the fasting plasma glucose (FPG) alone will miss approximately 30% of patients with isolated IGT. A recent consensus statement issued by the American Diabetes Association has recommended that if pharmacotherapy is used, both IFG and IGT should be documented. If only lifestyle modification is planned, a confirmatory test is not required.5,4 • IGT is detected when blood glucose levels are elevated (140–199 mg/dL) two hours after an Oral Glucose Tolerance Test is administered. • IFG is detected when blood glucose levels are elevated (100–125 mg/dL) after a fast of at least eight hours. See Table 1 for the tests and corresponding glucose values us
