A pregnant woman with fasting blood glucose of 5.6 mmol/L is considered to have gestational diabetes mellitus, which may be serious. Gestational diabetes mellitus can be diagnosed at 24-28 weeks of gestation and after 28 weeks of gestation when one or more of the following blood glucose values are met: fasting blood glucose greater than or equal to 5.1 mmol/L; 1-hour blood glucose greater than or equal to 10.0 mmol/L after taking 75 g of glucose; 2-hour blood glucose greater than or equal to 8.5 mmol/L. A fasting glucose of 5.6 mmol/L is considered probable gestational diabetes mellitus and requires further investigation. If you have been diagnosed with gestational diabetes mellitus, you will need to undergo further investigations. If the patient has been diagnosed with gestational diabetes mellitus, blood glucose control goals: fasting blood glucose should be less than 5.3mmol/L, 2 hours after meal blood glucose should be less than 6.7mmol/L. Fasting blood glucose 5.6mmol/L is higher than the blood glucose target value, and need to adjust the treatment. Pregnant women with fasting blood glucose 5.6mmol/L are advised to seek timely medical attention to clarify the situation and treatment under the guidance of a doctor.