User's Manual

G4-Global System User’s Guide | 51
4.4 CALIBRATION UPDATE
Calibration Update is required every 12 hours to make sure your Sensor
readings remain accurate and are close to your blood glucose meter readings.
You can enter any fi ngerstick readings you take during a Sensor session. If you
have not entered any fi ngerstick readings in the past 12 hours, the Receiver will
ask you for a fi ngerstick reading to update its calibration. The steps below show
you how to enter this calibration.
HELPFUL HINTS:
• If your readings are less than 40 mg/dL or greater than 400 mg/dL, you
should determine if you should treat yourself fi rst, and then calibrate when
it is convenient for you.
• If you choose to clear the Double Blood Drop
Prompt and calibrate later, the Blood Drop
Symbol
will appear in the top right corner of
the Trend Graph.
• Once you clear the Double Blood Drop Prompt,
it will reappear every 15 minutes until you
successfully calibrate.
• Always make sure the Antenna Symbol
is visible in the upper left
corner before you calibrate.
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.
You must enter the exact fi ngerstick reading that your blood glucose
meter displays. Enter all fi ngerstick readings for calibration within
5 minutes. Entering incorrect fi ngerstick readings, or fi ngerstick
readings that occurred more than 5 minutes ago, will affect device
performance.