Fasting blood sugar of 5.6mmol/L is not high and is considered normal. If the fasting blood sugar is 5.6mmol/L, it means that the blood sugar is slightly high in the normal range. The normal fasting blood glucose is 3.9-6.1mmol/L, 5.6mmol/L is in this normal range, but it is in the normal high value, so it needs to be alerted, and if necessary, it needs to control the diet to avoid further increase of blood glucose. If the fasting blood glucose of a pregnant woman is 5.6 mmol/L, it is necessary to pay attention to it, because the fasting blood glucose of a pregnant woman should be less than 5.1 mmol/L. When the fasting blood glucose of a pregnant woman is 5.6 mmol/L, it is necessary to perform further OGTT test, that is, glucose tolerance test, to confirm whether there is gestational diabetes. It is also necessary to control the diet and monitor blood glucose regularly, including fasting blood glucose and blood glucose 2 hours after meals. If the blood glucose remains in the high range, subcutaneous insulin injections will be needed to control the blood glucose.