No—most glucose monitors must come off for MRI, except MR-conditional models like FreeStyle Libre 2/3 under listed conditions.
Medical imaging teams get this question a lot: can you wear a glucose monitor in an MRI? The short answer for most wearables is “no.” A few newer sensors now carry MR-conditional labeling, which means they can stay on if the scan follows exact limits. This guide breaks down the brand-by-brand rules, what to tell the radiology team, and how to avoid data loss or device damage on scan day.
Wearing A Glucose Monitor During MRI: Model-Specific Rules
Different continuous glucose monitoring (CGM) systems carry different MRI instructions. The table below gives a quick, device-by-device view so you can plan the right move before you enter the scanner room.
| CGM System | MRI Status | What To Do Before The Scan |
|---|---|---|
| Dexcom G7 | MR Unsafe | Stop the session and remove sensor, transmitter, and receiver/phone from the scan room. |
| Dexcom G6 | MR Unsafe | End the session; remove sensor and transmitter; keep display devices outside the room. |
| Abbott FreeStyle Libre 3 / 2 | MR Conditional | May stay on if the site follows the listed scanner strength, body area, and time limits; leave phone/reader outside. |
| Eversense E3 (implantable sensor) | Sensor MR Conditional; Transmitter MR Unsafe | Remove the external smart transmitter; the implanted sensor can be scanned under listed conditions. |
| Medtronic Guardian Sensor 3/4 (with pump) | MR Unsafe | Remove pump, sensor, transmitter, and meter before entering the scanner area. |
| Older Libre (14-Day, legacy labels) | Often MR Unsafe | Check the exact model/IFU; many legacy sensors require removal before MRI. |
| Pods, Pumps, Controllers (any brand) | MR Unsafe | Remove all external infusion devices and keep controllers out of the scan room. |
Why MRI And CGMs Clash
MRI uses strong static magnets, fast-switching gradients, and radiofrequency energy. These fields can pull on ferromagnetic parts, induce heat in conductive materials, scramble electronics, or corrupt readings. CGMs marked “MR Unsafe” must be removed to prevent damage or inaccurate glucose data. MR-conditional labeling means the device was tested and can be scanned only inside a narrow envelope: specific field strength, body region, and scan duration.
Can You Wear A Glucose Monitor In An MRI? Device-By-Device Rules
Because the wording of the question matters for searchers and readers, let’s restate it clearly: can you wear a glucose monitor in an MRI? For Dexcom and many Medtronic sensors, the answer is no. For FreeStyle Libre 2 and 3, it’s yes—with strict conditions. For Eversense, the implanted sensor can be scanned under conditions, but the outer transmitter must come off.
Dexcom G7 And G6
Both are labeled MR unsafe. That means the sensor and transmitter come off before you reach the scanner room. End the session in the app, peel off the patch, and keep all components and display devices outside. Plan the appointment near the end of your wear period to avoid wasting a fresh sensor.
FreeStyle Libre 2 And Libre 3
These sensors carry MR-conditional labeling in the U.S. If your site follows the listed parameters, you can keep the sensor on during the scan. Phone and reader still stay outside. Expect temporary signal loss during the sequence with full function resuming after a short period.
Eversense E3 (Implantable)
The under-skin sensor is MR conditional; the adhesive smart transmitter on top is MR unsafe. Remove the transmitter before the test. Bring the device card that lists MRI conditions so staff can match the scanner settings.
Medtronic Guardian Sensors (With Pumps)
Remove pump, sensor, transmitter, and meter before entering the scanner area. Keep all accessories outside. Resume therapy after the scan per your diabetes team’s plan.
What To Tell The MRI Staff
- Brand and model of your CGM, plus whether it’s implanted or external.
- Exact sensor location on your body.
- Whether your system is MR conditional (Libre 2/3, Eversense sensor) and the conditions card or manual page if you have it.
- Any other wearables or implants (pumps, ports, stimulators, patches, jewelry).
Scan-Day Checklist
If Your CGM Is MR Unsafe
- Stop the session in your app or receiver.
- Remove the sensor and transmitter; store them away from the scanner room.
- Bring backup supplies and a meter; fingerstick checks fill the data gap.
- Resume with a new sensor after the scan and warm-up period.
If Your CGM Is MR Conditional
- Show staff the device card or manual with scanner limits.
- Leave your phone/reader outside the scan room.
- Expect the display to pause during the sequence; alerts may be unavailable.
- Plan to verify a reading after the scan, then continue normal use.
Libre And Eversense: The Fine Print That Matters
MR-conditional labeling isn’t a blanket “yes.” It’s a “yes, if the site follows the exact scanner strength, scan time, and body-area rules.” The second table summarizes headline conditions you’ll see in current manuals. Your radiology team always uses the full technical sheet; this table is a plain-language snapshot for planning.
| Device | Scanner & Time | Extra Notes |
|---|---|---|
| Libre 2 / Libre 3 | 1.5T: up to 60 min continuous; 3T: certain chest/abdomen regions may be limited to short runs with cool-down intervals. | Keep phone/reader outside; readings can pause; system function returns after a short period. |
| Eversense E3 (sensor) | 1.5T or 3T within listed SAR and gradient limits. | Transmitter must be removed; carry the MRI conditions card; expect a local image artifact near the sensor. |
| Legacy Libre (older labels) | Often labeled “remove before MRI.” | Confirm your exact model’s instructions; do not assume MR conditional without documentation. |
How To Minimize Data Gaps
Schedule the scan near the end of a sensor’s life if removal is required. If you use an MR-conditional Libre sensor, the stream may pause during the scan and resume afterward. If your care plan relies on alerts, ask the team to let you check a meter reading right after you exit the room.
How Radiology Teams Keep You Safe
Facilities screen every patient for devices, confirm model numbers, and follow the device’s MR label (unsafe vs. conditional). They set scanner strength and scan time to match the device’s window and keep unapproved wearables out of the room. If any part of the exam falls outside a device’s limits, the device comes off.
Quick Answers To Common Situations
“My Appointment Is Today And I’m Wearing Dexcom.”
Plan to remove it before you go into the scanner area. Bring a spare sensor, alcohol wipes, and your inserter so you can restart later.
“I Use Libre 3. Can I Keep It On?”
If your site can meet the MR-conditional limits, yes. The staff will position coils and choose sequences that stay inside the device’s window. Expect a short pause in data during the scan.
“I Have Eversense.”
Remove the outer transmitter and keep the implant card handy. The implanted sensor itself can be scanned under the listed conditions.
What To Bring To The Hospital
- Device box, app screen with model/version, or printed manual page with MRI language.
- Your Eversense implant card if you use the implantable system.
- Backup meter and strips for post-scan checks.
- Spare sensor and adhesive supplies if removal is required.
Bottom Line For Wearers
“Can you wear a glucose monitor in an MRI?” hinges on the make and model. Dexcom and many Medtronic sensors: remove before the scan. FreeStyle Libre 2 and 3: MR conditional when the site follows the listed limits. Eversense: implanted sensor is conditional; the transmitter comes off. Share device specifics early, bring documentation, and follow the staff’s plan.
Helpful References You Can Share With The Imaging Team
For clear, device-specific wording, link the exact manual page or labeling when you schedule. Two reliable starting points inside the body of this article:
- Abbott’s update on MR-conditional Libre sensors for imaging (opens in a new tab).
- Dexcom G7 user guide section on MRI/CT/diathermy (opens in a new tab).
This information guides safe use and preparation. It does not replace the instructions in your device’s manual or the decisions of your radiology team.