Dexcom G4 Professional User Manual page 32

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.
• The system accuracy may be affected when your glucose
is changing at a significant rate (e.g., 2-3 mg/dL/min or
more than 3 mg/dL each minute), such as during exercise
or after a meal. Since the system will not display your
glucose rate of change in blinded mode, avoid calibrating
after a meal or exercise.
• 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.
• 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.
Dexcom G4 PLATINUM Professional System User's Guide | 31