A 3-hour postprandial blood glucose of 7.7 mmol/L may be abnormal, and generally the 3-hour postprandial blood glucose level will return to the fasting blood glucose level, i.e., 3.9-6.1 mmol/L. Due to the difference in testing methods and reagents, the reference indexes of different hospitals are different, and need to be analyzed in detail. It should be noted that 3-hour postprandial blood glucose is not a diagnostic criterion for diabetes and is mostly recognized as random blood glucose. It is recommended that intravenous fasting blood glucose and 2-hour postprandial blood glucose measurements be performed under the guidance of a doctor to clarify the presence of elevated blood glucose. Patients with 3-hour postprandial blood glucose of 7.7mmol/L should go to the hospital to further improve the examination to clarify the diagnosis, and diagnosis and treatment under the guidance of the doctor, so as to avoid delays in the condition, resulting in serious consequences.