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. 2016 Aug 1;18(8):455–463. doi: 10.1089/dia.2015.0405

FIG. 1.

FIG. 1.

CGM Error Grid analysis. (A) CEG analysis: Zone A represents glucose values that are clinically accurate with error of <20%, Zone B represents values that are inaccurate by ≥20% but would lead to benign treatment assumptions, Zone C represents values that would result in overcorrecting elevated BG, Zone D represents potentially dangerous failure levels, and Zone E represents totally erroneous measurements. (B) SEG analysis: Clinical risk for errors in measurement is coded continuously from 0 to 4 with 0 representing no risk, 1 representing slight risk, 2 representing moderate risk, 3 representing great risk, and 4 representing extreme risk. (C) Overlaid CEG and SEG analysis: The discrete CEG and the continuous SEG are overlain for direct visualization of their relative presentations of the CGM data. BG, blood glucose; CEG, Clarke Error Grid; CGM, continuous glucose monitoring; SEG, Surveillance Error Grid.