Glucose Variability Index(GVI)
Definition
A composite score that combines the standard deviation and mean glucose of CGM data to quantify overall glycemic instability on a single scale. A GVI of 1.0 represents perfectly stable glucose, values below 1.2 indicate low variability, 1.2 to 1.5 indicate moderate variability, and values above 1.5 indicate high variability requiring clinical attention. GVI provides a more intuitive summary of glucose stability than coefficient of variation alone because it weights both the amplitude and frequency of glucose fluctuations.
Why “Glucose Variability Index” Matters for Glucose Monitoring
Understanding glucose variability index 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. CGM metrics transform thousands of raw glucose readings into actionable numbers that clinicians use to assess glucose control, adjust medications, and set treatment goals.
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
A standardized measure of glucose variability calculated as the standard deviation of glucose values divided by the mean glucose, multiplied by 100, expressed as a percentage.
The magnitude and frequency of blood glucose fluctuations over a defined period.
A statistical measure of how widely glucose values are spread around the mean glucose over a given period.
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.