Glucose Management Indicator (GMI) is a value calculated from continuous glucose monitoring (CGM) data that estimates the A1C level you might expect from a laboratory test.

GMI is derived from the average glucose measured over at least 12 days of CGM use. The result is often close to the lab-measured A1C but may also be slightly higher or lower.

Differences between GMI and laboratory A1C may be caused by:

• Individual variations in red blood cell lifespan
• Differences in how glucose binds to hemoglobin
• Recent changes in glucose control

GMI is a helpful indicator of recent glucose trends but is not a direct replacement for lab-measured A1C.