User`s guide

Dexcom G4 PLATINUM Professional System User’s Guide | 83
7.2 HOW TO CALIBRATE
You must enter the exact blood glucose value from the meter for each
calibration. Blood glucose values used for calibration must be between
40-400 mg/dL and must have been taken within the past 5 minutes.
•Inreal-timemode,makesureeitherasensorglucosereadingora
calibration needed symbol shows at the top of the trend graph in the
status area before calibrating. In blinded mode, make sure either “- - -
or a calibration needed symbol shows at the top of the trend graph
in the status area before calibrating.
•Thesensorcanbecalibratedifthemeterglucoseis40mg/dLor
above.Forsafetyreasons,ifthebloodglucoseislow,rsttreatthe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 the blood glucose. Do not switch the 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.