Need phone support? Request a callback. Visit our improved Help page for answers to frequent questions

Your First 10 Days with Dexcom ONE

How do I replace my sensor and start a new sensor session?

Last Updated · November 3, 2022

Ending Your Sensor Session

There are two ways to end your sensor session and start a new one:

  • Wait until it expires
  • End it early, at your convenience

Transmitters last about 3 months, so you'll reuse the same transmitter for many sensor sessions. Dexcom ONE will let you know when your transmitter will end.

Wait until the sensor expires

On the tenth day of your sensor session, you will receive a notification that your session is about to end. You will receive these notifications 24 hours, 6 hours, 2 hours, and 30 minutes prior to the official end of the sensor session. The session will end on its own to the exact hour and minute that the start sensor option was selected 10 days earlier. When it ends, remove the sensor and follow the onscreen instructions to start a new one.

End a sensor session early, at your convenience

  1. Go to Settings in the Dexcom ONE app.
  2. Tap Stop Sensor Session.
  3. Tap Stop Sensor to confirm.
  4. Tap OK to remove sensor now OR tap Sensor Removal Instructions for instructions to remove your sensor.
  5. After you remove your sensor, tap Start New Sensor.

How to remove a sensor:

When you remove your Dexcom ONE sensor, your transmitter also comes off. Remember that your transmitter is reusable; don’t throw it away until its battery has died.

How to remove sensor from your body

1. Remove sensor from your body

To remove sensor, peel off patch from the edge. When you peel off the adhesive, the sensor, transmitter holder and transmitter will all be removed. Do not remove the transmitter from its holder until all components have been removed from your body.

How to release Dexcom transmitter

2. Release Transmitter

To release the transmitter, snap the latch on its holder by pressing down on the lip at the bottom of the latch.

How to remove Dexcom transmitter

3. Remove Transmitter

Remove the transmitter by pulling it straight out of its holder. Keep the transmitter to use again in your next sensor session.

5-step learning journey

Discover education resources, organised in a 5-step journey, to learn key information about your Dexcom ONE CGM system, from getting started, your first 10 days, to using Dexcom ONE in the long run.

Step 1: The basics of CGM
Step 2: Getting started
Step 3: Your first 10 days
Step 4: Using Dexcom ONE in the long run
Step 5: Understand your Diabetes trends