User`s guide
Dexcom G4 PLATINUM User’s Guide | 73
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 calibration needed
symbol shows at the top of the trend graph before calibrating.
• Your sensor can be calibrated if your meter glucose is 40 mg/dL or
above.Forsafetyreasons,ifyourbloodglucoseislow,rsttreat
your low blood sugar.
• Always make sure the antenna symbol is in the upper left
corner of the trend graph before you enter 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.