User Manual

Performance Characteristics 89
Precision of Guardian RT Readings
This study was also designed to look at the reproducibility of two Sensors worn simultaneously at
different locations on the body. Precision was estimated by comparing the glucose readings from the two
Guardian RT systems. In this study 11,475 paired Sensor Guardian RT values were obtained. On average,
they were different by 17.2%. Figure 5.2 is an example of how data was paired in this study. In the
graph there are two tracings of Guardian RT values. Each tracing comes from a different Guardian RT
unit worn by one subject during a one-day period.
Figure 5.2
In Figure 5.2, Guardian RT device #1 is represented by a solid line, and the Guardian RT device #2 by a
light-gray line.
Low and High Alerts
The ability of the Guardian RT to detect high and low glucose levels was measured in the same clinical
study. Since it is important to set the alert levels in a conservative fashion, the Low Glucose Alert should
be set at a value slightly higher than the value of blood glucose you want to detect, and the High Glucose
Alert should be set at a value slightly lower than the value of blood glucose you want to detect.
NOTE - Please ask your doctor which low and high alert setting is best for you.
BD Monitor Calibration Point
BD Monitor Evaluation Point
Time of Day