User guide

Using your system
Calibrating your system
Calibrating your system helps to make sure that the glucose readings from the sensor are as accurate and
reliable as possible. You must periodically enter meter BG measurements to calibrate your system;
however, do not enter a meter BG until at least two hours after you have started a new sensor.
CAUTION: Sometimes your glucose levels change so rapidly that blood glucose measurements taken
during those times should not be used to calibrate your system. It is recommended that you do not
calibrate your system when your blood glucose may be changing rapidly, such as: within the first hour
after eating; when rapid change arrows appear on your monitor; or if you recently received a Rate of
Change alert. It is recommended that you calibrate your system only when your blood glucose is
stable, such as before meals or going to bed.
You may negatively affect your calibration accuracy if you allow your meter to automatically transmit
fingerstick blood glucose calibration values to your system when your blood glucose may be changing
rapidly. If you think your blood glucose may be changing rapidly, check the sensor glucose (SG)
information on your monitor before taking a fingerstick BG measurement. If your SG shows rapid changes,
unlink your meter before taking your fingerstick BG measurement.
Guidelines for calibrating the system
This section includes important recommendations and information about calibrating the system.
When should I calibrate the system?
When you need to calibrate your system, the monitor will show a METER BG NOW alert at the following
times:
• At least twice a day (once every 12 hours), whether or not you have inserted a sensor that day.
• Two hours after you insert a new sensor.
• Within six hours of first calibrating a new sensor, a failed calibration, or an invalidated calibration (for
example, entering a meter BG for calibration, then removing the battery for more than ten minutes).
Using your system 47
Chapter 6