User's Manual

G4-Global System User’s Guide | 47
The G4-Global System requires you to “calibrate” the Sensor
glucose readings to your blood glucose meter. The purpose
of calibration is to convert the measurement of glucose by the
Sensor into a reading similar to the one provided by your meter.
4.1 CALIBRATION OVERVIEW
When calibrating, you need to manually enter your fi ngerstick readings into the
Receiver. You can use any FDA-cleared blood glucose meter.
You will need to perform three types of calibration on your Receiver:
1. Startup Calibration 2. Calibration Update 3. Re-calibration
Startup Calibration happens at the end of the 1-hour Startup Period and takes 2
fi ngerstick readings. Calibration Update is a calibration that must be performed
every 12 hours (about 1 fi ngerstick reading, 2 times per day). The Receiver will
remind you when these calibrations are needed. Re-calibration may be required
if one of the fi ngerstick readings entered for Startup Calibration or Calibration
Update is not accepted by the Receiver.
The sections in this Chapter tell you how to calibrate your system. The sections
also describe Startup Calibration, Calibration Update, and how to Re-calibrate in
more detail.
HELPFUL HINT: Do not use alternative blood glucose site testing (blood
from your palm or forearm, etc.) for calibration. You must take your blood
glucose readings from your fi ngertips only for calibration.
CONTRAINDICATION: Use of acetaminophen-containing
medications while the Sensor is inserted may affect the performance
of the device.