What are the normal values for insulin at 1 hour, 2 hours, and 3 hours?

Under normal circumstances, the standard insulin levels are approximately 25-200 μU/mL after 1 hour, 30-130 μU/mL after 2 hours, and 3-25 μU/mL after 3 hours. Detailed analysis is as follows:

After eating, insulin secretion in healthy individuals increases along with rising blood glucose levels, reaching a peak at 1 hour, which effectively promotes glucose utilization. By the 2-hour mark, blood glucose levels gradually decline, and insulin secretion correspondingly decreases. At 3 hours, blood glucose returns to fasting levels, and insulin levels also normalize, showing a regular fluctuation pattern that reflects normal pancreatic function.

If the insulin peak at 1 hour is excessively high or delayed, and the levels at 2 and 3 hours remain significantly higher than fasting levels, it may indicate insulin resistance or impaired pancreatic function. These conditions are commonly seen in obese individuals and those with prediabetes, where insulin secretion is out of sync with blood glucose changes, easily leading to abnormal glucose control.

Insulin level testing should be interpreted together with blood glucose values. A single abnormal result cannot confirm a diagnosis, and repeat testing may be necessary. Consult a physician for proper interpretation of test reports when needed.