Dexcom G7 - Page 146

E • Technical Information | Dexcom G7 User Guide 139
Low Glucose alert
Estimates of how well the adjustable Low Glucose alert performs are presented in
Tables 5-A and 5-B. Tables 5-A and 5-B represent the hypoglycemic alert evaluation
within 15 minutes of each hypoglycemic alert in the study and the hypoglycemic event
evaluation within 15 minutes of the YSI value for adults and pediatrics, respectively.
Hypoglycemic alert rate
The alert rate shows how often the alert is right or wrong. The true alert rate is the
percentage of time the blood glucose level was at or below the alert setting within 15
minutes before or after the device alerted. The false alert rate is the percentage of
time the blood glucose level was above the alert setting within 15 minutes before or
after the device alerted.
For example, if you set the Low Glucose alert to 70 mg/dL and your alert sounds, how
often can you expect your blood glucose to actually be low? Based on results for
adults in the G7 Study (Table 5-A), when your alert sounds, you can expect your blood
glucose to be below 70 mg/dL approximately 86.9% of the time and above 70 mg/dL
approximately 13.1% of the time within the 15-minute period before or after your alert
sounds.
When the hypoglycemic alert rate was set at 55 mg/dL, and an alert was provided,
glucose was <70 mg/dL 91.3% of the time within 15 minutes of the alert based on the
result for adults (data not presented in table).
Hypoglycemic detection rate
The detection rate is the percentage of time the device alerted within 15 minutes
before or after the blood glucose level was at or below the alert setting. The missed
detection rate is the % of time the device did not alert within 15 minutes before or
after the blood glucose level was at or below the alert setting. For example, if you set
the Low Glucose alert to 70 mg/dL, how often will your G7 alert you if your blood
glucose goes below 70 mg/dL? Based on results for pediatrics in the G7 Study (Table
5-B), when your blood glucose goes below 70 mg/dL, you can expect your alert to
sound approximately 90.4% of the time and not to sound approximately 9.6% of time
within the 15-minute period before or after your blood glucose goes below 70 mg/dL.