Your learning journey with
Dexcom ONE
Follow these simple steps to discover what you need to know about setting up and using your Dexcom ONE real-time Continuous Glucose Monitoring (CGM) System.
Dexcom is here to support you on your journey with us, we’ll show you how to get the best out of your Dexcom ONE and where to find additional help and guidance.
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Getting started with Dexcom ONE

Overview of the Dexcom ONE system

Setting up Dexcom ONE on your smart phone*

To get set up, watch the video, then follow the instructions to download the Dexcom ONE app to your smartphone.*
Download the Dexcom ONE app from the App Store or Google Play store to your compatible smart device.* Follow the on-screen instructions, including watching the in-app training videos in full.
  • Download on the Apple Store
  • Get it on Google Play
Setting up Dexcom ONE with a receiver
Insert your Sensor and Attach The Transmitter
How are you doing ?
Have you successfully set up your Dexcom ONE system?
Response to further support will be within 48 hours.
Understand your glucose readings and trends

Setting your glucose alerts

Reuse your Transmitter

Your transmitter lasts up to 3 months. Reuse it for multiple sensor sessions. Your Dexcom ONE tells you when your transmitter will need to be replaced, starting 3 weeks before.
When the transmitter has less than 1 sensor session of battery life left, you will not be able to use it to start a new sensor session.
Remember to ensure that your transmitter is added to your repeat prescription requests.

Frequently Asked Questions

Q.How do I create a Dexcom user account?
If you ordered your supplies through this website, you can log in with the same Dexcom account details (email and password).
If you received funding for your Dexcom ONE and don’t yet have a Dexcom account, set one up in the app using the inapp instructions.

Looking for help?

Don’t worry, our Technical Support Team are here to help you with your Dexcom ONE system.
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Your first 10 days

Your Dexcom ONE sensor lasts up to 10 days. Next, we will show you how to replace your sensor and how your system can guide your treatment decisions.
This page is for supplementary purposes only, please refer to your IFU for complete instructions.
*For a list of compatible smart devices, visit

LBL-1000331 Rev003

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