User`s guide

Dexcom G4 PLATINUM Professional System User’s Guide | 193
on average, CGM reads 7.3 mg/dL (0.4 mmol/L) higher than the
reference at YSI glucose levels of 40-60 mg/dL (2.2-3.3 mmol/L) and
reads 3.6 mg/dL (0.2 mmol/L) higher than the reference at YSI glucose
levelof61-80mg/dL(MeanDifference,i.e.3.4-4.4mmol/L),9.8%
different than the reference at YSI glucose values of 301-350 mg/dL
(MeanAbsolutePercentDifference,i.e.16.7-19.4mmol/L),and8.8%
different than the reference at YSI glucose values of 351-400 mg/dL
(Mean Absolute Percent Difference, i.e. 19.4-22.2 mmol/L).
Low and High Glucose Alerts
The ability of the System to detect high and low glucose levels
(concentrations) is assessed by comparing System results to YSI results
at low and high blood glucose levels and determining if the alert may
have sounded. The System and YSI readings were compared by pairing
the System reading that occurred immediately after the YSI reading was
collected. There were 9555 paired System and YSI results evaluated.
We suggest that you ask your doctor what alert settings would be best
for you.
The Low Glucose Alert
Estimates of how well the adjustable Low Glucose Alert performs are
presented in Table 5.
Table 5. Hypoglycemic Alert Evaluation
Hypoglycemic
Alert Level
mg/dL (mmol/L)
True
Alert
Rate
False
Alert
Rate
Hypoglycemia
Detection Rate
Hypoglycemia Missed
Detection Rate
55 (3.1) 50% 50% 71% 29%
60 (3.3) 64% 36% 75% 25%
70 (3.9) 79% 21% 83% 17%
80 (4.4) 87% 13% 86% 14%
90 (5.0) 90% 10% 89% 11%