Dexcom G5 User Manual page 105

Calibrations are a must to make sure the CGM system is performing at its
best.
By calibrating when the system notifies you that a calibration is due, the G5
Mobile uses your meter's BG value to make sure the sensor glucose readings
remain accurate throughout your session.
How Do I Calibrate?
Take a fingerstick measurement from your meter, and simply enter the
meter's BG value into one display device. This chapter lets you know what
precautions you need to take before taking your BG meter value, then
entering your data. Up to now, you needed to enter information such as Alerts,
transmitter SN, etc., separately for the receiver and smart device. Calibration
is different. You only need to enter calibrations into one display device.
Don't enter your BG values into both devices; enter into either your app or the
receiver. If you enter your meter's BG value into your receiver, it takes about
five minutes for your sensor glucose readings to begin. In approximately ten
minutes, you can view the readings in the other display device.
How Often Do I Calibrate?
There are three primary "must do" calibration events, each with its own
prompts:
1. Two initial calibrations once your warmup session is complete.
2. Update calibrations done twice daily, once every 12 hours.
3. When you're prompted.
If you receive a calibration prompt outside of your scheduled calibration
schedule, either the system doesn't accept your most recent calibration or
your meter's BG value is very different from the sensor's glucose reading.
Don't worry about keeping track of the time between calibrations, the system
will prompt you when you are ready for another.
Now that you have an overview of calibration, let's review some
contraindications, warnings, and precautions you need to know and follow
before you calibrate.
Dexcom G5 Mobile System User Guide
Calibration
105