Sensor Inaccuracies - Dexcom G4 PLATINUM User Manual

Often, the system can correct the problem and continue providing sensor glucose readings. If it has been
at least 3 hours since your last sensor glucose reading, contact Technical Support (see Chapter 15, User
Assistance).
If you see these system glucose error icons often, follow these troubleshooting tips before inserting
another sensor:
• Make sure your sensor is not expired.
• Make sure your sensor pod is not dislodged or peeling up.
• Make sure your transmitter is snapped in completely.
• Make sure nothing is rubbing the sensor pod (i.e. clothing, seat belts, etc.).
• Make sure you selected a good insertion site (see Chapter 6, Section 6.3, Choosing an Insertion Site).
• Make sure your insertion site is clean and dry before sensor insertion.
• Wipe the bottom of the transmitter with a damp cloth or isopropyl alcohol wipe. Place the transmitter
on a clean, dry cloth and air dry for 2-3 minutes.

13.5 SENSOR INACCURACIES

Inaccuracies are usually related to your sensor only and not your receiver or transmitter. Your sensor
glucose readings are meant to be used for trending purposes only. Your blood glucose meter and sensor
measure your glucose from two different types of body fluids: blood and interstitial fluid. Therefore, your
readings from your blood glucose meter readings and sensor may not match.
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.
PRECAUTION
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.
If the difference between your sensor glucose reading and blood glucose value is greater than 20% of the
blood glucose value for sensor glucose readings > 80 mg/dL or greater than 20 points for sensor glucose
readings < 80 mg/dL, wash your hands and take another blood glucose measurement. If the difference
between this second blood glucose measurement and the sensor is still greater than 20% for sensor
glucose readings > 80 mg/dL or greater than 20 points for sensor glucose readings < 80 mg/dL,
recalibrate your sensor using the second blood glucose value. The sensor glucose reading will correct
over the next 15 minutes. If you see differences between your sensor glucose readings and blood
glucose values outside of this acceptable range, follow the troubleshooting tips below before inserting
another sensor:
• Make sure your sensor is not expired.
• Make sure you do not calibrate when the or is shown.
77