The patient’s fasting 6.86 mmol/L and postprandial 5.2 mmol/L did not meet the diagnostic criteria for diagnosing diabetes mellitus and was not considered diabetic. The diagnostic criteria for diabetes mellitus show that fasting blood glucose is greater than or equal to 7.0 mmol/L, and 2-hour postprandial blood glucose is greater than or equal to 11.1 mmol/L. The patient’s fasting blood glucose of 6.86 mmol/L is between 6.1 and 7.0 mmol/L, which is impaired fasting glucose, and it is recommended that the patient consult a doctor promptly to perfect the glucose tolerance test, insulin release test, and C-peptide release It is recommended that the patient should consult a doctor in time and complete the glucose tolerance test, insulin release test and C-peptide release test under the guidance of the clinician to assess the patient’s islet function. Meanwhile, it is recommended that the patient should have a light diet, eat fewer meals, drink less porridge, candies and fruits or beverages with high sugar content, exercise appropriately after meals, control body weight, and eat more fiber-rich foods. Therefore, the patient’s fasting blood glucose is high and postprandial blood glucose is normal, which has not yet reached the standard of diabetes mellitus, but has impaired fasting blood glucose, it is recommended that the patient seek medical treatment in a timely manner, and follow the clinician’s advice to monitor the blood glucose level regularly, so as to avoid delaying the condition.