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CGM Configuration

CGM Choices

A CGM can be added from the Heads-Up-Display (HUD) or from the Loop Settings screen.

The HUD will look like the graphic below if no CGM or Pump is connected with Loop:

Loop HUD when CGM and Pump have not been added

Loop can be connected to the following CGMs:

  • CGMs that reside on the same phone (internet not required)
    • Dexcom G5
    • Dexcom G6
    • Minimed Enlite CGM
      • Medtronic Pump only
      • You must add pump first
        • If Enlite is connected to Medtronic pump and that pump is connected to Loop, then an option for Enlite shows up when choosing a CGM, not visible in graphic below
  • CGMs that require active internet (WiFi or Cell)
  • CGM Simulator - useful to learn the app interface


To add a CGM, go to the Settings screen, tap on add CGM and tap on your CGM.

graphic showing some of the CGMs available with Loop 3

Dexcom G5 and G6 CGM

To use the Dexcom G5 and G6:

  • Dexcom app must be running on the Loop iPhone and paired to an active transmitter
  • User must enter that active transmitter ID in the location indicated by the red rectangle in the graphic below
  • Do not enter your Share Credentials
    • The graphic below shows Tap to set
    • Do not tap, leave it alone
  • Only add the transmitter ID to Loop after it is paired with the Dexcom app on your phone

interface to add transmitter ID for Dexcom

FYI: When You Change Transmitters

Before you change Dexcom transmitters, select the Delete CGM button at the very bottom of the CGM info page in Loop. Then, follow Dexcom Instructions for changing transmitters. Once the new transmitter is paired with the Dexcom app, go to the CGM page in Loop, tap Add CGM and enter the new transmitter ID. You cannot just tap on your old transmitter ID to update it.

If you don't update your transmitter ID in Loop after you change the transmitter in Dexcom app, Loop will not get CGM data from the Dexcom app on your phone.

About Dexcom Share credentials

You do NOT need your Share account info listed in Loop settings if you are using a G5 or G6 system. The transmitter ID is sufficient. In fact, you should leave your Share credentials blank so that you don't accidentally become internet-dependent for CGM data if you forget to update your transmitter ID when you start a new transmitter.

Medtronic Enlite CGM

The Medtronic Enlite CGM is only available if you have connected it to your compatible Medtronic Pump.

  • Make sure your pump reports the Enlite CGM results
  • Go through the Add Pump to Loop steps with that Medtronic pump
  • Then do the Add CGM steps and the sensor should be presented as an option

Dexcom Share as a CGM

If you need to use Dexcom Share

If the dexcom is on another phone, you can use Share if internet / cell coverage is good.

The Dexcom Share credentials (in other words, account login) is the same as what you used to log in to the active Dexcom app on your iPhone. Dexcom Share account is not always the same login info as your Dexcom Clarity account. The information is entered when you first log in to the app and then is never displayed again, nor visible under any information screens. If you have forgotten your G5/G6 account info, you can delete the Dexcom app and redownload it to try logging in again. This will not cause a restart of any sensor sessions in progress.

If you do not enter your Share credentials correctly into Loop, you will get an error when Loop tries to access your Share account to backfill CGM data. An example of the error message is shown in the graphic below. If you see that message, delete your Share account from Loop settings and try again.


Nightscout Remote CGM

If the user has CGM data available at their Nightscout URL, they can select that as a source for CGM data for Loop. The user must acknowledge they understand the risks of using a remote source that requires internet, as shown in the graphic below.

Nightscout Remote CGM acknowledgement screen

The user must enter both the URL and API_SECRET for their site to ensure the security of the data. The URL must start with https:// and cannot have any extra spaces in the line.

Nightscout Remote CGM entry screen

When using Nightscout Remote CGM, if the user needs to change credentials or switch to a different CGM, the user must go through the Loop->Settings->CGM menu.

Change CGM

To change CGMs, delete your existing CGM and then add a new CGM.

  • For Dexcom G5/G6 and Share, access Delete CGM by tapping on the CGM Icon in the HUD or by tapping on Loop Settings and selecting CGM and scrolling down.

  • For Nightscout Remote CGM, the Nightscout URL is opened when tapping on the CGM icon in the HUD, while the credential sections with the Delete CGM row is shown when tapping on Loop Settings and selecting CGM.

After deleting a CGM, the Head-Up-Display at the top of the Loop main screen will show the add CGM icon.

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