| Summary: | Diabetes is diagnosed by 2-hour BGL ≥ 11.1 mmol/L on OGTT, fasting BGL ≥ 7.0 mmol/L or HbA1C ≥ 6.5%. IFG and IGT are similarly diagnosed by elevated fasting and 2-hour BGLs. Although-hour BGL is routinely measured, results are classified as NGT if fasting and 2-hour levels are normal, irrespective of elevation at 1 hour. It has, however, been shown that 1-hour postload BGL is a strong predictor of future risk for type 2 diabetes and vascular disease, even in those with NGT. Additionally Meisinger et al. identified 1-hour postload glycaemia as a long-term predictor for all-cause mortality in men without diabetes. There is no normal range for 1-hour glucose, but ≥ 8.6 mmol/L has been identified as a cut-off marking increased cardiovascular and diabetes risk. It has been suggested that recognition and management of those with NGT and 1-hour glucose ≥ 8.6mmol/L may reduce incidence of diabetes and vascular events.
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