Normal postprandial blood glucose level at 1 hour

Regarding the diagnosis of diabetes, only fasting and 2-hour postprandial blood glucose levels are assessed. A fasting blood glucose level ≥7.0 mmol/L or a 2-hour postprandial blood glucose level ≥11.1 mmol/L confirms a diagnosis of diabetes. Then, what is the normal blood glucose value for healthy individuals at 1 hour after a meal?

Normal 1-Hour Postprandial Blood Glucose Level in Healthy Individuals

In healthy individuals, the 1-hour postprandial blood glucose level is typically around 8.7 mmol/L; values up to 11.1 mmol/L are still considered within the normal range. Levels exceeding 11.1 mmol/L warrant consideration of possible diabetes, and an oral glucose tolerance test (OGTT) should be performed—measuring blood glucose at fasting, 30 minutes, 60 minutes, 120 minutes, and 180 minutes after glucose ingestion. Normal reference ranges are as follows: fasting blood glucose 3.9–6.0 mmol/L; 2-hour postprandial blood glucose <7.7 mmol/L. Diabetes is diagnosed when fasting blood glucose is ≥7.0 mmol/L or 2-hour postprandial blood glucose is ≥11.1 mmol/L.

If blood glucose exceeds these thresholds, further evaluation—including fasting blood glucose, 2-hour postprandial blood glucose testing, or OGTT—is recommended to assess for abnormal glucose metabolism or diabetes. Among individuals with impaired glucose metabolism, approximately 8% progress to overt diabetes within one year. Particular vigilance is warranted in those with a family history of diabetes or comorbidities such as hypertension, coronary artery disease, hyperlipidemia, or hyperuricemia.

When blood glucose levels exceed the normal range, timely screening via oral glucose tolerance testing is strongly advised. We hope this information is helpful to you!