Fasting blood glucose 6.2mmol / L if the state of stress can often return to normal, if non-stress state, part of the impaired fasting blood glucose can also return to normal, it is recommended to follow the doctor’s instructions for treatment. 1. Stress: if surgery, severe trauma, infection and other stress, sympathetic nerve excitation, adrenocorticotropic hormone and other glucagon secretion increases, can cause a transient increase in blood glucose, fasting blood glucose can be 6.2mmol / L, generally remove the stress factors blood glucose can be restored to normal. 2. Non-stress state: the normal value of fasting blood glucose is 3.9-6.1mmol/L, fasting blood glucose 6.2mmol/L and other blood glucose indexes are normal, can be considered as impaired fasting blood glucose, if found early, timely diet, exercise intervention or drug intervention, part of the normalization. Fasting blood glucose 6.2mmol/L should go to the hospital, under the guidance of the doctor’s treatment.