User`s guide

Dexcom G4 PLATINUM User’s Guide | 169
Precision of System Readings
In the Original Study, 36 subjects wore two Systems. This was to look
at how similarly two Systems function on the same subject (sensor
precision). Precision was evaluated by comparing the glucose readings
from the two Systems worn on the same subject at the same time.
Results showed that System readings from the two sensors generally
agreed with each other within 9% (absolute percent difference) with a
7%coefcientofvariation.OnlyoneSystemwaswornintheSoftware
505 Study so precision data was not collected in this study.
Sensor Life
Sensors may be worn for up to 7 days (168 hours). To estimate how
long a sensor will work over 7 days, 108 sensors were evaluated with
the Original Study to determine how many days/hours of readings each
sensor provided. Ninety-four percent (94%) of the sensors lasted until
Day 7 (145-168 hours). There were 6 (6%) sensors that ended early,
four of which lasted more than 3 days.
For the Software 505 Study, 51 sensors were evaluated to determine
how many days/hours of readings each sensor provided. Ninety-eight
percent (98%) of the sensors lasted until Day 7 (145-168 hours). There
was 1 (2%) sensor that ended early, which lasted until day 5 of the
sensor wear.