Dexcom G4 PLATINUM User Manual page 15

glucose. Insertion in those areas might affect sensor performance, and you might miss a
low or high blood glucose value.
• Avoid injecting insulin or placing an insulin pump infusion set within 3 inches of the
sensor. The insulin might affect sensor performance, and you might miss a low or high
blood glucose value.
• Do not use the sensor if its sterile package has been damaged or opened. Using an
unsterile sensor might cause infection.
• To calibrate the system, enter the exact blood glucose value that your blood glucose
meter displays within 5 minutes of a 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 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.
• 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.
• 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 USB port, the receiver could become damaged and stop
displaying readings or providing alerts, 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.
• Do not discard your transmitter. It is reusable. The same transmitter is used for each
session until you have reached the end of the transmitter battery life.
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