Sensor Inaccuracies - Dexcom G4 Platinum User Manual

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9.5

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.
Your sensor glucose readings may be inaccurate if you calibrate
less than every 12 hours.
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 value. Entering incorrect blood
glucose values or blood glucose values from more than 5 minutes
ago could result in inaccurate sensor glucose readings.
If you see a difference between your sensor glucose reading and blood
glucose value outside the 20%/1.1 mmol/L industry standard, wash your hands
and take an additional blood glucose measurement. If the blood glucose
value remains outside the industry standard, enter this blood glucose value
as a calibration into your receiver. 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 your next sensor:
• Make sure your sensor is not expired.
• Make sure you do not calibrate when the
• 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 obtained from a blood glucose value. Use a blood glucose value
obtained only from a fingerstick for calibration.
• Only blood glucose values between 2.2-22.2 mmol/L can be used for
calibration. If one or more of your readings entered was outside of this range,
the receiver will not calibrate. You will have to wait until your blood glucose is in
this range to calibrate.
104 | Dexcom G4 PLATINUM Continuous Glucose Monitoring System
or are displayed.