Startup Calibration; 12 Hour Calibration Update - Dexcom g4 User Manual

4.3

STARTUP CALIBRATION

Two hours after you start the sensor session (see
Chapter 3, Section 3.7, Starting a Sensor Session)
the receiver will tell you that you need to calibrate by
displaying the startup calibration prompt. This prompt
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
to clear the display.
2. Take 2 separate blood glucose measurements with your meter and enter the
blood glucose values into the receiver (see Chapter 4, Section 4.2, How to
Calibrate).
3. You can clear the prompt by pushing the
symbol will remain at the top of the trend graph until you calibrate. The system
will re-alert you every 15 minutes until you enter the blood glucose values. You
will not receive sensor glucose readings until the receiver accepts the blood
glucose values.
If you do not clear the prompt, the system will re-alert you every 5 minutes.
4.4

12 HOUR CALIBRATION UPDATE

Calibrate your system every 12 hours after your initial calibration (performed at 2
hours after sensor insertion) to make sure your sensor glucose readings remain
accurate and are close to your blood glucose meter values. You can enter any
blood glucose values you take during a sensor session. If you have not entered
any blood glucose values in the past 12 hours, the receiver will ask you to enter
a blood glucose value to update its calibration. The following steps show you
how to enter this calibration.
Your sensor glucose readings may be inaccurate if you calibrate
less than every 12 hours.
Startup calibration prompt
SELECT button
SELECT button. The blood drop
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