Calibrating Your Sensor

Calibrating your sensor allows you to use CGM values to make therapy decisions, such as insulin dosing, and increases the accuracy of CGM values. You calibrate your sensor by entering a current glucose value from your blood glucose meter into the app. The app prompts you to do so within the first day of use.

There are 2 modes of CGM values: Trend Mode and Therapy Mode. The mode the sensor is currently in is indicated directly below the CGM value on the Home screen.

When the sensor is in Trend Mode:

  • CGM values should not be used to make therapy decisions, such as insulin dosing.
  • CGM values can be used only to see trends and as a general reference.
  • To make therapy decisions, such as insulin dosing, test your blood glucose with your blood glucose meter.

When the sensor is in Therapy Mode:

  • CGM values can be used to make therapy decisions, such as insulin dosing.

The glucose measurements of the sensor are more accurate if you calibrate at a point in time when your blood glucose level is relatively stable.

Do not calibrate shortly after a meal, after insulin administration, or after physical activity, and avoid environments with very hot or very cold temperatures, or rapidly changing temperatures.

The calibration routine consists of two steps:

After a warm-up time of 1 hour, the sensor is in Trend Mode, and sends CGM values to the app every 5 minutes. Don’t use these initial CGM values to make therapy decisions, such as insulin dosing. 12 hours after insertion of the sensor, the app prompts you to calibrate.

Step 1: Perform a blood glucose test and enter the glucose value into the app. The sensor goes into Therapy Mode. CGM values can now be used to make therapy decisions, such as insulin dosing.

Step 2: 30 minutes to 3 hours later, perform another blood glucose test and enter the glucose value into the app. This is to confirm the first measurement. Note: If step 2 is missed, the sensor returns to Trend Mode.

The calibration routine is completed for the sensor.

To calibrate your sensor:

  1. Test your blood glucose with your blood glucose meter, according to the manufacturer’s instructions.
  2. Tap Calibrate Now on your Home screen.
  3. Enter the glucose value from your blood glucose meter in the Calibrate screen. The glucose value should be entered no later than 3 minutes after performing the test.
  4. Tap Save.
  5. Check that you entered the same glucose value into the app that was displayed on your blood glucose meter and tap Confirm. If you accidentally entered an incorrect value, tap Cancel and enter the correct value.
  6. Your sensor is calibrated.

If calibration is unsuccessful, wait approximately 15–30 minutes before repeating the process. When repeating the process, use a new glucose value from your blood glucose meter.

System performance can’t be guaranteed if an incorrect blood glucose value is used for calibration.

If you confirm an incorrect calibration value, it can’t be deleted. Remove the sensor and apply a new one.