Dexcom G4 User Manual page 9

• Avoid areas that are likely to be bumped, pushed or compressed or areas of
skin with scarring, tattoos, or irritation as these are not ideal sites to measure
glucose.
• Avoid injecting insulin or placing an insulin pump infusion set within 7.62 cm of
the sensor in case the insulin affects the sensor glucose readings.
• The sensor is sterile in its unopened, undamaged package. Do not use any
sensor if its sterile package has been previously damaged or opened.
• To calibrate the system, you must 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 ago could result in inaccurate sensor
glucose readings.
• The transmission range from the transmitter to the receiver is up to 6 meters
without obstruction. Wireless communication does not work well through water
so the range is much less if you are in a pool, bathtub, water bed, etc.
• Sensors should be stored at temperatures between 2° C - 25° C for the length
of the shelf life. You may store your sensors in the refrigerator if it is within this
temperature range. Sensors should not be stored in a freezer.
• Keep the USB port cover on the receiver closed whenever the USB cable is not
attached. The receiver may malfunction if water gets into the USB port.
Dexcom G4 User's Guide | 9