User's Manual

142 | Continuous Glucose Monitoring System
11
Number of Readings Provided
The G4-Global Receiver is capable of providing a reading up to every 5 minutes,
or up to 288 readings per day. For a variety of reasons, this does not always
happen. Sometimes sensors cannot provide readings after calibration and
readings are “skipped” (see Chapter 5). Table 11, below, estimates the number
of readings you can expect to receive from the G4-Global Receiver over the
entire 7-day period. For example, 87% of G4-Global Receiver devices provided
between 1,557 and 1,992 readings (or at least 76% of the expected number of
readings).
Approximately 7% of readings were lost because the Transmitter and Receiver
were not communicating. Approximately 1% of the time the G4-Global Receiver
required additional calibration readings to start displaying glucose readings
again. Over 7 days of use, on average, subjects experienced 3 periods of time
where the Receiver could not display glucose readings and displayed “???”
instead. These periods lasted on average for 1 hour. A small percentage of
subjects (<10%) experienced a period of missing glucose readings (or “???”)
for more than 4 hours. However, per the Sensor Life data above, 89% of the
Sensors were able to “recover” from these periods of signal problems and begin
displaying continuous glucose readings again.
Table 11. Number of Readings Provided by Each Sensor Over 7-Days
% of Total Possible
Readings Provided
Total
Readings
Provided
% of G4-Global Receiver Devices
Providing that number of readings
0-25% 261 1%
26-50% 521-782 7%
51-75% 1005-1477 4%
76-100% 1557-1992 87%
Section 11.1
Placeholder for G4-Global Receiver Pivotal Study Results