User`s guide

Dexcom G4 PLATINUM User’s Guide | 165
Hyperglycemia Alert Rate
The Alert Rate shows how often the alert is right or wrong. The True
Alert Rate is the % of time the device alarmed when the blood glucose
level was at or above the alert setting within 15 minutes before or after
the device alarmed. The False Alert Rate is the % of time the device
alarmed when the blood glucose level was below the alert setting within
15 minutes before or after the device alarmed.
For example, if you set the High Glucose alert to 200 mg/dL and your
alarm sounds, how often can you expect your blood sugar to actually
be high? Based on the Original Study, if your alarm sounds, you can
expect your blood sugar to be at or above 200 mg/dL approximately
92% of the time and not be above 200 mg/dL approximately 8% of the
time within the 15 minute period before or after your alarm sounds.
Based on the Software 505 Study, if your alarm sounds, you can expect
your blood sugar to be at or above 200 mg/dL approximately 96% of the
time and not be above 200 mg/dL approximately 4% of the time within
the 15 minute period before or after your alarm sounds.
Hyperglycemia Detection Rate
The Detection Rate shows how often the device recognizes and alerts
you to an episode of hyperglycemia or how often it misses such an
event. The Hyperglycemia Detection Rate is the % of time the blood
glucose level was at or above the alert setting and the device alarmed
within 15 minutes before or after the blood glucose was at or above the
alert settings. The Hyperglycemia Missed Detection Rate is the % of
time the blood glucose was at or above the alert setting, but the device
did not alarm within 15 minutes before or after the blood glucose was at
or above the alert setting.
For example, if you set your High Glucose alert to 200 mg/dL, how often
will your alarm alert you if your blood glucose goes at or above 200
mg/dL? Based on the Original Study, if your blood sugar goes above
200 mg/dL, you can expect your alarm to sound 97% of the time and not
to sound approximately 3% of time within the 15 minute period before or
after your blood sugar goes above 200 mg/dL. Based on the Software
505 Study, if your blood sugar goes above 200 mg/dL, you can expect