Random blood glucose is the value of glucose content measured from venous or peripheral blood drawn from the body at any given moment, and the reference range for random blood glucose is less than 11.1 millimoles per liter. If the value of random blood glucose is greater than or equal to 11.1 mmol per liter, there is a possibility of stress hyperglycemia. Stress hyperglycemia is caused by infections or eating too many carbohydrates at one time, etc. Blood glucose will gradually return to normal after the stressor is removed. A diagnosis of diabetes can be made if the random blood glucose value is greater than or equal to 11.1 mmol/L and there are typical symptoms of diabetes. Patients diagnosed with diabetes mellitus should be treated aggressively as prescribed by their doctor. High random blood glucose will lead to discomfort. Patients should adopt good living habits and improve their diet to avoid high blood glucose values. If the random blood sugar is high or low, you should go to the hospital immediately and take treatment under the guidance of the doctor.