1. Dietary factors
Eating a lot of indigestible food at night, or eating dinner too late (if it is too late, the fasting time will be less than 8 hours), which may lead to a high fasting blood glucose value the next morning. In addition, in order to get better fasting blood glucose results, some patients will deliberately eat less staple food the night before the examination, so that the fasting blood glucose value is lower than usual. Therefore, in order to ensure the authenticity of fasting blood sugar the next morning, dinner must be kept in a normal state.
2. Time utilization coefficient
Fasting blood glucose measurement must be completed before 8:00 am. However, it often happens that many patients rush to the hospital from home in the morning without eating or drinking in order to see a specialist, and then register for treatment. They often have to wait until after 9:00- 10:00 in the morning to see a doctor and measure their blood sugar. At this time, although the patient is in an fasting state, due to the influence of the biological clock, glucagon has gradually increased after 8 o'clock, and even if he does not eat, his blood sugar will increase. Therefore, the fasting blood glucose measured at this time is not true, just random blood glucose.
In addition, some patients walk a long distance to the hospital, so the measured blood sugar may be lower than usual; If you wait too long, feel unhappy, emotional, etc. Your blood sugar may rise again. For 1 type diabetic patients, delaying or delaying insulin injection in the morning will lead to a significant increase in blood sugar.
The blood sugar measured in the above situation is not fasting blood sugar in the true sense. Therefore, patients are advised to take food, medicine or insulin after completing fasting blood glucose test at home or in a nearby community health center, and then go to the hospital for treatment.
3. Sports factors
Improper morning exercise is a common cause affecting fasting blood sugar. So when we ask to check fasting blood sugar, we don't have to do morning exercises. Because blood sugar will drop after general exercise, if blood sugar rises instead, it may be mild hypoglycemia during exercise, which will lead to an increase in reactive blood sugar. These are untrue fasting blood glucose results.
Many people like to do morning exercises before breakfast. This practice is unscientific and easy to cause hypoglycemia. You'd better eat something before doing morning exercises. Pay attention to check the blood sugar before and after exercise in the morning exercise in order to find the right amount of exercise.
4. Drug factors
Drugs are an important factor affecting the results of fasting blood glucose. If the dose of insulin is too large at night, it will lead to Sumujie phenomenon and abnormal increase of fasting blood sugar in the morning. If some patients find that fasting blood sugar is high, they will eat less breakfast or take hypoglycemic drugs during meals, so that fasting blood sugar is higher than 2 hours after breakfast. Some patients taking health care products containing hypoglycemic drugs will also affect fasting or postprandial blood sugar.
5. Sleep factors
American scientists divide the sleep time of a day into three categories: less than 6 hours, 6-8 hours and more than 8 hours, and observe the influence of sleep time on blood sugar. It has been found in the study for 6 years that the proportion of fasting blood glucose changes from normal to abnormal in people who sleep less than 6 hours a day, which is 4.56 times that of people who sleep 6-8 hours. There is no difference between people who sleep for more than 8 hours and those who sleep for 6-8 hours. It can be seen that diabetic patients sleep less than 6 hours every night, which is easy to cause abnormal fasting blood sugar. In order to get real fasting blood glucose, you must ensure adequate sleep time the night before.
6. Stress factors
Recent bad mood, anxiety and depression, insomnia and dreaminess may all lead to higher fasting blood sugar than usual, which cannot reflect the real drug effect or illness. In addition, if acute infection or trauma occurs, blood sugar often rises due to stress factors. Some patients with gastroenteritis, nausea and vomiting, can't eat anything, so they stop taking medicine. Some patients think that there is no need to inject insulin without eating, which leads to severe hyperglycemia ... The measured fasting blood glucose in these cases cannot reflect the real basal fasting blood glucose, and must be treated symptomatically, and hypoglycemic drugs cannot be adjusted.
7. Monitoring methods and blood glucose meter factors
This is a very common factor that affects the truth of fasting blood glucose, and it is also often mentioned by us. Incorrect monitoring method, unqualified or long-term uncorrected blood glucose meter, expired test paper and poor quality will all affect blood glucose results.