Five hours after the meal belongs to the fasting state, at this time the stomach has been basically emptied, the normal range should be 3.9 ~ 6.1 mmol / L, blood glucose value of 6.2 mmol / L, may be abnormal, can be further improved postprandial blood glucose, glycated hemoglobin and other tests, a clear diagnosis. Blood glucose begins to rise 0.5~1 hour after starting to eat, and reaches a peak around 1 hour, then blood glucose gradually declines and returns to normal level in 2~3 hours. Normal people’s gastric emptying time is 4~6 hours, 5 hours in the stomach food is basically empty, belong to the fasting blood sugar state. The normal range of fasting blood glucose is 3.9~6.1mmol/L, and blood glucose 6.2mmol/L is slightly higher than normal. If there are trauma, surgery, shock and other stressful situations before measuring blood glucose, which can cause transient blood glucose elevation, it is recommended to eliminate the stress factors, further improve the postprandial blood glucose, glycated hemoglobin and other tests, and review the fasting blood glucose, in order to clarify the diagnosis.