Fasting blood glucose 5.2 that is, fasting blood glucose 5.2mmol / L, whether normal need to be specific, divided into different groups, namely, adults, pregnant patients, etc., the specific situation is analyzed as follows: 1. Adults: usually, for normal adults, fasting blood glucose does not exceed 6.1mmol / L is normal, so fasting blood glucose 5.2mmol / L is also normal. 2. Pregnant patients: for pregnant patients, fasting blood glucose requirement is not more than 5.1mmol/L, fasting blood glucose is 5.2mmol/L is out of the normal range, so in pregnancy still need to pay attention to avoid overeating, small amount of meals. In summary, fasting blood glucose 5.2mmol / L is normal or not need to look at specific, not a generalization, there are abnormalities need to be under the guidance of the doctor systematic treatment.