User`s guide
Dexcom G4 PLATINUM User’s Guide | 139
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 these troubleshooting tips before inserting another sensor:
• Make sure your sensor is not expired.
• Make sure you do not calibrate when the or is shown.
• Do not use alternative blood glucose site testing (blood from your
palm or forearm, etc.) for calibration as alternative site readings may
be different than those from a blood glucose value. Use a blood
glucosevalueonlyfromyourngersforcalibration.
• Use only blood glucose values between 40-400 mg/dL for
calibration. If one or more of your readings is outside of this range,
the receiver will not calibrate.
• Use the same meter you routinely use to measure your blood
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.