Diabetes is diagnosed by elevated blood glucose, but if fasting glucose alone is checked, diabetes is more likely to be missed, so attention should also be paid to postprandial glucose and, if necessary, an OGTT test.
Diabetes is diagnosed by symptoms of diabetes (polyuria, polyphagia, polyphagia, and lethargy) + random blood glucose ≥11.1 mmol/L or fasting blood glucose ≥7.0 or blood glucose ≥11.1 mmol/L after 2 hours of OGTT. If you don’t have the typical three symptoms, you need to retest your blood glucose at a later date, and if it is still elevated, you are more likely to have diabetes.
So when the fasting blood glucose is 6.8, you need to add a 2-hour postprandial blood glucose, and if the 2-hour postprandial blood glucose is <7.8, then the diagnosis of impaired fasting should be considered. If the random blood glucose is 6.8, there is no diagnostic significance, and fasting blood glucose and two-hour postprandial blood glucose should be measured to determine whether it is diabetes according to the above diagnostic criteria. In addition, if the fasting blood glucose is 6.8 and diabetes cannot be diagnosed, it is also necessary to improve unreasonable dietary structure and rest habits to prevent the occurrence of diabetes.