Normal postprandial blood glucose levels after fasting
Disease description:
I heard that blood glucose levels need to be measured twice, once fasting and once after a meal. Could you please tell me what are the normal values for fasting and postprandial blood glucose?
Doctor's answer (1)
Dr. Yang Ziqi
The reference ranges for normal fasting and postprandial blood glucose levels are as follows:
1. Fasting Blood Glucose:
The normal level is 3.9–6.1 mmol/L.
If the blood glucose level is higher than 6.1 mmol/L but less than 7.0 mmol/L, it indicates impaired fasting glucose, which is a diagnosis of prediabetes.
- If two separate fasting blood glucose tests on different days both show levels greater than or equal to 7.0 mmol/L, diabetes can be diagnosed.
2. Postprandial Blood Glucose:
This mainly refers to blood glucose levels two hours after eating, with a normal value of less than 7.8 mmol/L.
If the two-hour postprandial blood glucose level is greater than 7.8 mmol/L but less than 11.1 mmol/L.
These values represent widely accepted standards, but specific diagnostic criteria may vary slightly among different healthcare institutions and countries. If in doubt, it is recommended to consult a qualified physician for a more accurate assessment and guidance. Additionally, regular blood glucose monitoring, especially for individuals with a family history of diabetes or other risk factors, is very important.
