User`s guide

Dexcom G4 PLATINUM User’s Guide | 77
7.3 STARTUP CALIBRATION
Two hours after you start the sensor session
(see Chapter 6, Section 6.7, Starting a
Sensor Session) the receiver tells you
that you need to calibrate by showing the
startup calibration prompt. This means you
need to calibrate with 2 separate blood
glucose values from your meter. You
will not see sensor glucose readings
until the receiver accepts the blood
glucose values.
1. When you see this screen, press the SELECT button to clear it.
a. The startup calibration symbol will stay at the top of the trend graph
until you calibrate.
b. The system will re-alert you every 15 minutes until you enter the
blood glucose values.
c. If you do not clear the prompt, the system will re-alert you every
5 minutes.
2. Take 2 separate blood glucose measurements with your meter, and
enter the blood glucose values into the receiver (see Chapter 7,
Section 7.2, How to Calibrate).
Startup calibration prompt
PRECAUTION
To calibrate the system, enter the exact blood glucose
value that your blood glucose meter displays within
5 minutes of a carefully performed blood glucose
measurement. Entering incorrect blood glucose values or
blood glucose values from more than 5 minutes before
entry might affect sensor performance, and you might
miss a low or high blood glucose value.