Postprandial Glucose
Definition
Blood glucose levels measured after eating, typically peaking 60 to 90 minutes after a meal and returning to baseline within 2 to 3 hours in healthy individuals. A postprandial spike above 140 mg/dL may indicate impaired glucose tolerance, while consistent spikes above 180 mg/dL suggest inadequate insulin action. CGMs uniquely reveal how different foods, portion sizes, and meal compositions affect an individual's glucose response — data that fingerstick tests taken at a single point in time cannot capture.
Why “Postprandial Glucose” Matters for Glucose Monitoring
Understanding postprandial glucose is essential for anyone using or evaluating a continuous glucose monitor. This concept directly affects how CGM devices are designed, how glucose data is interpreted, and how clinical decisions about blood sugar management are made. Medical terms related to glucose physiology help patients and clinicians communicate effectively about blood sugar patterns, treatment goals, and the clinical significance of CGM data.
This term applies broadly across all continuous glucose monitors and is foundational knowledge for interpreting CGM data, whether you are managing diabetes or using a sensor for metabolic wellness.
Related Terms
The magnitude and frequency of blood glucose fluctuations over a defined period.
Abnormally high blood glucose, generally defined as levels above 180 mg/dL after meals or above 130 mg/dL fasting.
A metabolic condition in which the body's cells respond poorly to the hormone insulin, forcing the pancreas to produce progressively larger amounts to maintain normal blood glucose levels.
The percentage of time a person's glucose level remains within a defined target range, typically 70 to 180 mg/dL for most people with diabetes.