When To Calibrate - Dexcom G5 MOBILE User Manual

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 prompts, etc.
There are important times when you must calibrate:
1. Initial or 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: your next calibration is due 12 hours from the LAST
calibration, but you may be notified for a calibration sooner.
With calibration prompts, 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.
Initial Calibration: Sensor Startup Completed
1. When notified (see next table) enter two back-to-back fingerstick measurements
into just one device.
2. No need to do initial calibrations twice.
a. Calibration data flows between the receiver and your app.
b. Ten-minute reporting delay between devices.
3. First update calibration is 12 hours after your initial calibration.
Update Calibration
Update calibrations are typically performed 12 hours since your last calibration; however,
they can be done sooner. As an example, if you know your next calibration is due at 4 AM,
you can do the calibration before bedtime, resetting the 12-hour countdown.
1. Enter one fingerstick measurement at least every 12 hours.
2. Display devices provide calibration prompts.
3. Your next calibration is due 12 hours from the LAST calibration but you may be
prompted to calibrate sooner.
Dexcom G5 Mobile System User Guide
Calibration
108