Mean Absolute Relative Difference (MARD) is a standard metric used to evaluate the accuracy ofcontinuous glucose monitoring systems,^[1] which gives the average amount a CGM sensor reading varies from the actualblood glucose.^[2] It is calculated by taking the average of the absolute relative differences between the glucose readings reported by the CGM system and corresponding reference measurements, typically obtained through laboratory analysis orblood glucose meters.^[3] A lower MARD value indicates greater accuracy, and it is commonly used in clinical research and regulatory evaluations to compare the performance of different CGM devices. It is also of note that MARD percentages can vary by person, even while using the same device.^[1]

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