How To Calibrate - Dexcom G4 PLATINUM User Manual

PRECAUTION
Do not use alternative blood glucose site testing (blood from your palm or forearm,
etc.) for calibration. Alternative site blood glucose values may be different than those
taken from a fingerstick blood glucose value and may not represent the timeliest blood
glucose value. Use a blood glucose value taken only from a fingerstick for calibration.
Alternative site blood glucose values might affect sensor performance, and you might
miss a low or high blood glucose value.

7.2 HOW TO CALIBRATE

You must enter the exact blood glucose value from your meter for each calibration. Blood glucose values
must be between 40-400 mg/dL and must have been taken within the past 5 minutes.
• Make sure either a sensor glucose reading or a
graph before calibrating.
• Your sensor can be calibrated if your meter glucose is 40 mg/dL or above. For safety reasons, if your
blood glucose is low, first treat your low blood sugar.
• Always make sure the antenna symbol
blood glucose values for calibration.
• Always use the same meter to calibrate that you routinely use to measure your blood glucose. Do not
switch your meter in the middle of a sensor session. Blood glucose meter and strip accuracy vary between
blood glucose meter brands.
• The accuracy of the blood glucose meter value used for calibration may affect the accuracy of sensor
glucose readings.
WARNING
Calibrate at least once every 12 hours. Calibrating less often than every 12 hours
might cause sensor glucose readings to be inaccurate, and you might miss a low or
high blood glucose value.
PRECAUTION
Do not calibrate if your blood glucose is changing at a significant rate, typically
more than 2 mg/dL per minute. Do not calibrate when your receiver screen is
showing the rising single arrow or double arrow, which indicates that your blood
glucose is rising 2-3 mg/dL/min or more than 3 mg/dL/min. Also, do not calibrate
when your receiver screen is showing the falling single arrow or double arrow,
which indicates that your blood glucose is falling 2-3 mg/dL/min or more than 3
mg/dL/min. Calibrating during significant rise or fall of blood glucose may affect
accuracy of sensor glucose readings.
calibration needed
is in the upper left corner of the trend graph before you enter
39
symbol shows at the top of the trend