Dexcom G7 - Page 137

Agreement when CGM reads LOW or HIGH
G7 reports glucose readings between 40 and 400 mg/dL. When G7 determines the
sensor reading is below 40 mg/dL, it displays LOW on the receiver or mobile app .
When G7 determines the glucose level is above 400 mg/dL, it displays HIGH on the
receiver or mobile app. Because G7 does not display glucose values below 40 mg/dL
or above 400 mg/dL, the comparisons to the actual blood glucose levels (as
determined by the YSI analyzer) when CGM is classified as LOW or HIGH are included
separately in Table 2. The table includes the numbers and the cumulative percentages
when YSI values were less than certain glucose levels (for LOW), and when YSI values
were greater than certain glucose levels (for HIGH).
For example, when G7 displayed LOW (298 occasions), 96% (286 out of 298) of the
YSI values were less than 80 mg/dL. When G7 displayed HIGH (356 occasions), 100%
(356 out of 356) of the YSI values were greater than 320 mg/dL.
Table 2. Distribution of YSI Values when G7 CGM sensor readings are LOW or
HIGH
CGM sensor
readings
CGM-YSI pairs
YSI (mg/dL)
Total
< 55 < 60 < 70 < 80 ≥ 80
LOW n 99 145 233 286 12 298
Cumulative
percent
33% 49% 78% 96% 4%
CGM sensor
readings
CGM-YSI pairs
YSI (mg/dL)
Total
> 340 > 320 > 280 > 250 ≤ 250
HIGH n 347 356 356 356 0 356
Cumulative
percent
97% 100% 100% 100% 0%
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