User's Manual

Dexcom G5x System User Guide
Calibration
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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.
7.4 When to Calibrate
Calibrating on a regular schedule aligns your sensor glucose readings with
your meter’s BG values. Without calibrations, your sensor may be inaccurate,
and as a result, so will your display device’s sensor glucose readings, Alerts,
and notifications, etc.
There are important times when you must calibrate:
1. Startup Calibration: two hours after you insert your sensor.
2. 12 Hour Update Calibration: every 12 hours after two-hour startup
calibration.
3. When system notifies you.
With calibration notifications, your sensor and display device help you keep
your calibration schedule on track. If your BG values are not between 40-400
mg/dL, the system won’t accept your calibration. Wait until you are within the
40-400 mg/dL range before entering your BG values.
Startup Calibration: Sensor Startup Completed
1. At notifications (see next table) enter two back-to-back fingerstick
measurements into just one device.
2. No need to do startup calibrations twice.
a. Calibration data flows between the receiver and your app.
b. Five minute reporting delay between devices.
3. First update calibration is 12 hours after your startup calibration.
Update Calibration
Enter an update calibration every 12 hours after your initial calibration. Below
is a sample calibration schedule. As you can see from the calendar’s BG
meters, you:
1. Inserted your sensor and entered initial two calibrations on Monday at
10 AM.
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