Drawing on several large studies, leading US diabetes research and advocacy groups are recommending screening for "prediabetes," a condition marked by glucose levels above normal but below the threshold for type 2 diabetes mellitus. Blood glucose levels in this range often lead within a decade to diabetes and raise the risk for heart attack and stroke.
The recommendations call for physicians to give fasting plasma glucose or oral glucose tolerance tests to overweight people aged 45 years and older. The same tests should be considered for people younger than 45 if they have a body-mass index greater than 25 kg/m2 and another risk factor, particularly hypertension or a family history of diabetes. Overweight nonwhites are also considered at high risk.
Vastag B. Prediabetes Screening Urged. JAMA. 2002;287(19):2494. doi:10.1001/jama.287.19.2494