Understanding your estimated A1c

Updated June 19, 2026

Estimated A1c is a figure Glynce calculates from your average CGM glucose over a period. It is often called the glucose management indicator, or GMI. It gives you a sense of your longer-term glucose without waiting for a lab test.

How to read it

• It moves with your average glucose, so a lower average gives a lower estimate.
• It needs enough readings across the period to be meaningful.
• It is an estimate from CGM data, so it can differ from a lab A1c.

Why it can differ from your lab result

A lab A1c measures something slightly different, and individual biology varies. A gap between your estimate and your lab number is expected and does not mean either is wrong.

Use estimated A1c as a trend indicator. Your lab A1c and your care team remain the reference for any clinical decision.