User`s guide

Dexcom G4 PLATINUM User’s Guide | 23
carefully performed blood glucose measurement. Entering
incorrect blood glucose values or blood glucose values
from more than 5 minutes before entry might affect sensor
performance, and you might miss a low or high blood
glucose value.
•Donotcalibrateifyourbloodglucoseischangingata
signicant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signicantriseorfallofbloodglucosemayaffect
accuracy of sensor glucose readings.
•Thesystemaccuracymaybeaffectedwhenyourglucose
ischangingatasignicantrate(e.g.,2-3mg/dL/minor
more than 3 mg/dL each minute), such as during exercise
or after a meal.
•Thetransmissionrangefromthetransmittertothe
receiver is up to 20 feet without obstruction. Wireless
communication does not work well through water so the
range is much less if you are in a pool, bathtub, or on a
water bed, etc. Types of obstruction differ and have not
been tested. If your transmitter and receiver are farther than
20 feet apart or are separated by an obstruction, they might
not communicate or the communication distance may be
shorter and you might miss a low or high blood glucose
value.
•KeeptheUSBportcoveronthereceiverclosedwhenever
the USB cable is not attached. If water gets into the