Calibrating your sensor

MiniMed 780G insulin pump with Guardian Sensor 3
MiniMed 780G insulin pump with Guardian 4 sensor

Device: MiniMed 780G insulin pump with Guardian Sensor 3


Your continuous glucose monitoring (CGM) system requires blood glucose (BG) meter readings to provide you with sensor glucose (SG) readings. These BG meter readings are entered into the pump and are used for sensor calibrations. Calibrations are important for optimal CGM performance. CGM does not eliminate the need for BG meter checks.

To calibrate, enter a BG meter reading from a blood glucose meter. Do not enter a SG value in place of a BG meter reading. The entered glucose value is used to calibrate the sensor. The BG meter reading must be between 40-400 mg/dL to calibrate.

Calibration Schedule

After inserting a new sensor, a calibration is needed:

  • Within 2 hours after you connect the transmitter to your sensor and start the warm-up period
  • Again within 6 hours (first day of inserting sensor only)
  • Again every 12 hours
  • When the system detects that a calibration is needed for optimal performance

After the first day, the minimum number of calibrations required is one every 12 hours, but you may receive an alert if one is needed sooner. Calibrating three or four times per day is optimal.

Approximately two hours after starting a new sensor or any other time a calibration is necessary, you will receive an “Enter BG now” alert.

Enter BG now screen

If you cannot calibrate right away, for example, if you are driving or in a meeting, you can set the Snooze to remind you to calibrate in the time that you set. You can change the time if you desire, and press Select. A Calibration Required banner will appear on the Home screen.

Calibration required screen

Calibrating the Sensor

There are several different ways that you can enter a BG reading to calibrate the sensor.

To calibrate by using the Accu-Chek® Guide Link meter:

When you use the Accu-Chek® Guide Link meter, the meter value automatically appears on the BG Meter screen.

  1. Check your BG. Press the Back Button on the meter to send the BG reading to the pump automatically.
  2. Select Yes on the pump to confirm the BG meter reading. The meter BG will be automatically used for the Bolus Wizard™ screen, or the SmartGuard Bolus screen, for the next 12 minutes.

    If you do not believe the meter result is accurate, do not confirm. Select No, wash your hands and recheck your BG.

    BG meter screen

  3. A BG received message appears.

    BG meter screen

To calibrate through the Blood Glucose screen:

  1. From the Home screen, press Menu select.
  2. Select Menu drop.
  3. Enter BG and select Save. The entered BG will calibrate the sensor. The first SG reading appears up to 5 minutes after calibration.

    Sensor glucose readings screen

NOTE: If you notice a large difference between your BG meter reading and SG readings, wash your hands and do another BG fingerstick test. Also, check the sensor site and make sure the sensor overtape is holding the sensor in place. If it is not, you may need to remove the sensor and insert a new one.

Calibration Reminder:

You can use the Calibration reminder to give you notice before the next calibration is necessary. For example, if you calibrated at 7:00 AM your next calibration would be due at 7:00 PM (12 hours later). If your reminder is set for 4 hours, you would receive a Calibration reminder at 3:00 PM which is 4 hours before the calibration is due. This can help ensure you calibrate 3-4 times a day. The Calibration reminder defaults On with a reminder time of 1:00 hour.

To change the Calibration Reminder:

  1. From the Home screen, press Menu select, select Menu settings, select Alert Settings, select Reminders and select Calibration.

    Calibrating Your Sensor

  2. Select Reminder to turn the reminder on or off.
  3. If you turn on the reminder, select Time and enter a time between 5 minutes and 6 hours.
  4. Select Save.

Device: MiniMed 780G insulin pump with Guardian 4 sensor


When you are using the MiniMed 780G system with the Guardian 4 sensor, you do not need to calibrate. However, the system is designed to use every BG meter reading either entered manually or received from a glucose meter to calibrate the sensor. The BG meter reading must be between 50 and 400 mg/dL to calibrate.

Calibration reminder

This feature is not applicable when using the Guardian4 sensor.

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