For pregnant women with undiagnosed diabetes and pregnant women who have been diagnosed with diabetes, a fasting blood glucose of 6.4mmol/L for pregnant women is not normal, and is on the high side. 1. Pregnant women with undiagnosed diabetes: due to changes in hormone secretion during pregnancy, the normal value of fasting blood sugar for pregnant women is lower than that of normal people, and the normal value of fasting blood sugar for pregnant women is 3.1-5.1mmol/L. Therefore, the fasting blood sugar of pregnant women of 6.4mmol/L is not normal. 2. Pregnant women who have been diagnosed with diabetes mellitus: all types of gestational hyperglycemia pregnancy glucose target: fasting blood glucose <5.3mmol / L, so pregnant women fasting blood glucose 6.4mmol / L is higher than the normal range, it is recommended to comply with the doctor’s advice for treatment. Pregnant women with abnormal fasting blood sugar can consult a professional doctor in detail for diagnosis and treatment to avoid delays.