Elderly people’s blood sugar 7.3mmol/L is high if it is fasting blood sugar, but normal if it is 2 hours after meal or random blood sugar. Fasting blood glucose is usually taken in the morning fasting at least 8 hours of blood for testing, its normal value of 3.9 ~ 6.0mmol / L, if the elderly blood glucose 7.3mmol / L is on the high side, and two consecutive fasting blood glucose ≥ 7.0mmol / L, can be diagnosed as diabetes mellitus. If the blood glucose of the elderly is 2-hour postprandial blood glucose, the reference value is <7.8mmol/L. If the blood glucose of the elderly is 7.3mmol/L, it is normal. If the blood glucose of the elderly is random blood glucose, the reference value is <11.1mmol/L, and if the blood glucose of the elderly is 7.3mmol/L, it is normal. Therefore, whether the blood sugar is normal or not needs to be determined according to the respective reference value, and if the diagnosis is diabetes mellitus, it needs to be actively treated under the guidance of the doctor.