What OGTT reading indicates prediabetes?

A reading of 140-199 mg/dl on an Oral Glucose Tolerance Test (OGTT) indicates prediabetes. This range reflects impaired glucose tolerance, which is a precursor to developing type 2 diabetes. It signifies that while blood sugar levels are not high enough to meet the criteria for diabetes, they are elevated compared to healthy, normal levels.

In the context of glucose metabolism, a reading above normal but below the threshold for diabetes (which starts at 200 mg/dl) serves as a warning signal for individuals who may be at risk of progressing to diabetes if lifestyle changes are not implemented. Tailoring diet, increasing physical activity, and monitoring health can be critical interventions at this stage.

The other options reflect normal or diabetic glucose levels. Less than 140 mg/dl is considered normal glucose tolerance, while a reading of 200 mg/dl or higher confirms a diagnosis of diabetes. The range of 100-139 mg/dl is indicative of impaired fasting glucose, which does not correspond directly to the OGTT criteria for prediabetes. Understanding these thresholds is essential for both prevention and management of diabetes.