Seven
™
System User’s Guide | 111
LOW AND HIGH GLUCOSE ALERTS
e ability of the Seven System to detect high and low blood glucose levels is assessed
by comparing Seven System results to YSI results at low and high glucose levels
(concentrations), and determining if the alert would have sounded. e Seven System
and YSI readings were compared by pairing the Seven System reading that fell within
2.5 to 7.5 minutes after the YSI reading was collected. ere were 2,346 pairs of paired
Seven System and YSI results evaluated. We suggest that you ask your doctor what Alert
settings would be best for you.
e Low Glucose Alert
Estimates of how well the adjustable Low Glucose Alert performs are presented in the
table below. For example, the data in the table shows that if you set the Low Glucose
Alert to 70 mg/dL, the Seven System will alert you 68% of the time when your actual
blood glucose levels are at or below 70 mg/dL (True Alert Rate). e table also shows
that at the same Alert setting (70 mg/dL), the Low Alert will not alert you 32% of the
time (“Missed Alert Rate***”). Also at the 70 mg/dL alert level, 63% of the time the Seven
System will falsely alert you that your glucose level is at or less than 70 mg/dL when your
glucose level will actually be above 70 mg/dL.
If you set the Low Glucose Alert to 90 mg/dL, the Seven System will alert you 85% of the
time when your glucose levels are at or below 90 mg/dL. e table also shows that at the
same Alert setting (90 mg/dL), the Low Alert will not alert you 15% of the time (“Missed
Alert Rate***”). Also at the 90 mg/dL alert level, 36% of the time the Seven System will
falsely alert you that your glucose level is at or less than 90 mg/dL when your glucose level
will actually be above 90 mg/dL.
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