What is the most accurate CGM in 2026?

Based on published MARD data, Dexcom G7 reports the lowest accuracy deviation at approximately 8.2–8.5% (1) .

What does MARD mean in CGM devices?

MARD (Mean Absolute Relative Difference) measures how closely CGM readings match laboratory reference glucose values. Lower percentages indicate higher accuracy.

Is Libre 3 nearly as accurate as Dexcom G7?

Yes. Libre 3 reports a MARD around 8.9% (2) , which remains within a highly accurate clinical range.

Does CGM accuracy affect insulin pump performance?

Yes. In hybrid closed-loop systems, improved accuracy can enhance automated insulin delivery decisions.

Are implantable CGMs more accurate?

Eversense E3 reports a MARD around 8.5% (4) , comparable to leading disposable CGMs.

Dexcom G7

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