Enter your average glucose from at least ten days of continuous monitoring. The GMI estimates the A1c you would expect from that glucose pattern.
GMI
— %
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- Risk spectrum with your position marked
- Reference ranges from the original publication
- Shareable link, nothing stored
Scientific references
Why GMI exists
Laboratory A1c and average glucose often disagree because red cell lifespan varies between people. GMI translates sensor data into the A1c scale using a regression from large CGM datasets.
The formula
GMI equals 3.31 plus 0.02392 times the mean glucose in mg/dL. A mean of 154 mg/dL gives 7.0 percent, and 183 mg/dL gives about 7.7 percent.
Understanding your result
- Below 7 percent meets the target for most non pregnant adults
- 7 to 8 percent is acceptable for some older or higher risk patients
- Above 8 percent usually prompts treatment intensification
Using it well
Pair GMI with time in range. Two people can share a GMI while one has dangerous lows and the other does not.