1. Do not stop the medication for fasting blood glucose test, as the test result will not accurately reflect the condition, but will also cause blood glucose fluctuation and aggravate the condition. 2. For patients who inject premixed insulin in the morning and before dinner, if the treatment is delayed due to the blood test in the morning, you can temporarily change the injection of “short-acting insulin” after the blood test and before the meal, which can eliminate the increase in blood sugar caused by the delay in treatment and avoid the “premixed insulin” in the morning and evening on the day of the test. This can eliminate the elevation of blood glucose caused by the delay of treatment, and also avoid the interval between the two injections of “premixed insulin” in the morning and evening of the examination day. 3. For patients treated with oral hypoglycemic drugs, if the blood collection time is too late and the morning and noon drugs are too close to each other, the amount of noon drugs can be reduced as appropriate to avoid hypoglycemia caused by the superposition of drug effects. 4. For patients treated with medium-acting insulin injected before bedtime, the blood collection time for fasting glucose testing can be later because the hypoglycemic effect can be maintained until 8 to 9 o’clock the next day. 5. Do not go to the hospital to have blood drawn after the insulin injection at home. Since the time to complete blood sampling is unpredictable, if the blood cannot be drawn within half an hour, it will inevitably delay the meal time, which may induce serious hypoglycemia. 6. If the time of blood collection cannot be determined, it is better to treat and eat normally at home in the morning, and then go to the hospital to measure blood sugar 2 hours after meal, which will not affect normal meal and medication and will not cause fluctuation of blood sugar. More and more studies show that postprandial blood glucose can better reflect whether the amount of meals and medication taken is appropriate. 7. Do not diet excessively the day before the test. The results measured in this way may be more “ideal”, but they do not represent the true situation of the usual blood sugar control. 8. In order to ensure the accuracy and reliability of the test results, you should continue to maintain your usual diet and medication on the day before the test, and ensure a good sleep at night. In addition, you should avoid strenuous exercise, smoking and drinking stimulating drinks such as coffee before taking blood test in the next morning. 9. For patients with low level of their own insulin secretion and early morning hyperglycemia, it is better to complete the determination of fasting blood glucose at home beforehand with a fast blood glucose meter, write down the results, then go to the hospital and tell the doctor the results for his or her reference, so as not to delay the treatment before breakfast.