User's Manual

G4-Global System User’s Guide | 57
This chapter will teach you how to view your G4-Global System
continuous glucose readings and trend information. Once you
have successfully calibrated, the G4-Global Receiver will display
your glucose readings every 5 minutes. This will tell you how
your glucose levels are changing.
Your blood glucose meter only gives your blood glucose level at one point in time
(like a still picture). However, the G4-Global System Trend Graphs and Trend
(Rate of Change) Arrows will help you understand the direction your glucose
level is moving (like a video camera).
The G4-Global Sensor sits in the fl uid under your skin, not in your blood. The
Sensor calculates a glucose reading from this fl uid when you calibrate your
System. So, the glucose reading you see on your Receiver may be about
5-10 minutes behind the fi ngerstick reading you get from your meter. If your
meter reading is above 80 mg/dL, the G4-Global System readings can be
10 – 20% different from your meter readings. If your meter reading is below 80
mg/dL, the G4-Global System readings can be up to 20 mg/dL different from
your meter readings.
It is important that you focus on the trends and rate of change on your Receiver,
rather than the exact glucose reading. The Trend Graphs and Arrows will help
you determine how fast your glucose level is rising or falling. Chapter 11, Section
11.2 tells you how closely your G4-Global System readings will be to a laboratory
analyzer in the doctor’s offi ce.
Glucose Alerts and the Low Glucose ALARM are designed to help you stay
within your target glucose zones. Your Low and High Glucose Alerts, and Rise
and Fall (Rate of Change) Alerts can tell you when you fall outside of your target
glucose range. Your Alerts are personal tools that you can set (see Chapter 2,
Section 2.5), and are determined by you and your Diabetes Management
Team. Your Low Glucose ALARM can tell you when your glucose levels may be
reaching potentially dangerous low levels.
You must update G4-Global System calibration every 12 hours
at a minimum. The performance of the System when calibrated
less frequently than every 12 hours has not been studied. Use of
acetaminophen-containing medications while the Sensor is inserted
may affect the performance of the device.