Can CGMs Go Through Airport Security? What Every Diabetic Traveler Needs to Know

I've worn a CGM through airport security more times than I can count — first the FreeStyle Libre 2, and more recently the Medtronic Guardian sensor paired with my MiniMed 670G.

And if there's one thing I've learned from all those security lines, it's that the rules are not the same for every device.

With the Libre 2, my main concern was always the full-body scanner — metal detectors were never an issue, but I learned early on to request a pat-down when I spotted a full-body scanner at the checkpoint. The Guardian adds another layer, since I have to consider the pump and sensor together as a system when I'm navigating security.

What I wish someone had told me earlier: CGMs are not all equal at airport security. The specific device you're wearing matters enormously. And knowing the specific rules for your sensor before you reach the checkpoint makes the whole experience faster, calmer, and less stressful.

Here's the breakdown.

👉 If you're also traveling with an insulin pump, the security rules get more layered. Our detailed guide on Insulin Pumps at Airport Security covers every major pump brand and exactly what each manufacturer recommends — including the important differences between the Omnipod DASH, Omnipod 5, Medtronic MiniMed, Tandem, and others.

Can CGMs Go Through Airport Security?

Yes — and the good news is that for most modern CGMs, security is far less complicated than it used to be.

But here's the catch:
not all CGMs have been tested to the same standard.
The rules differ between models and even within the same brand.

The general framework that applies to all CGMs:

• Walk-through metal detectors — safe for virtually all CGM sensors
• Hand-held wanding — safe for virtually all CGM sensors
• Full-body scanners (AIT/millimeter wave) — varies by device; some are cleared, others are not
• X-ray baggage machines — most manufacturers advise against putting sensors or receivers through these

And for all of the above: you always have the right to request a pat-down instead of going through any scanner. This is the safest default if you're ever unsure.

Dexcom G7 — The Most Airport-Friendly Option Right Now

The Dexcom G7 currently has the most permissive airport security guidelines of any major CGM — and this is a meaningful upgrade from its predecessor.

At security checkpoints, you can keep your Dexcom G7 sensor on while passing through metal detectors and Advanced Imaging Technology (AIT) body scanners.

Alternatively, you may ask for hand-wanding or a full-body pat-down and visual inspection.

Dexcom G7 is also safe to go through carry-on luggage scanning and will not affect product performance.

This means G7 users have real flexibility — you can walk through a full-body scanner without worry, or request a pat-down if you prefer. Extra sensors in your bag can go through the X-ray conveyor belt without issue.

Summary for Dexcom G7:

• ✅ Metal detectors — safe
• ✅ Full-body AIT scanners — safe
• ✅ Carry-on luggage X-ray — safe 
• ✅ Hand-wanding and pat-down — always an option

⚠️ Important distinction from the G6: The rules above apply to the Dexcom G7 only. The Dexcom G6 has different guidance — Dexcom advises G6 users to avoid AIT body scanners entirely and request a pat-down or metal detector instead. If you've recently upgraded from G6 to G7, your security approach changes — and it changes in your favour.

FreeStyle Libre 2 (and Libre 2 Plus, Libre 3) — Proceed With Caution on Scanners

This is the sensor I wore for several years, and the one that first made me aware that CGM security rules deserve more attention than most people give them.

FreeStyle Libre 2, FreeStyle Libre 2 Plus, FreeStyle Libre 3 and FreeStyle Libre 3 Plus sensors can be exposed to common electrostatic and electromagnetic interference, including airport metal detectors.

However, some airport full-body scanners include millimeter radio-wave technology, which you cannot expose your FreeStyle sensor to. The extent of these scanners has not been evaluated and the exposure may damage the FreeStyle Libre sensor or cause inaccurate results. To avoid removing your sensor, you may request another type of screening. 

In my experience, the practical challenge with this guidance is that you often don't know which type of scanner you're facing until you're already at the checkpoint.

My approach was always to inform the officer I was wearing a medical sensor and ask what type of scanner was being used. If there was any doubt, I requested a pat-down. It adds a couple of minutes, but it's far better than risking a damaged or inaccurate sensor mid-flight.

Summary for FreeStyle Libre 2/3:

• ✅ Metal detectors — safe
• ⚠️ Full-body scanners — avoid millimeter radio-wave scanners; ask which type before proceeding
• ❌ Millimeter radio-wave full-body scanners — do not go through; remove sensor or request pat-down
• ✅ Hand-wanding and pat-down — always safe alternatives

Medtronic Guardian Sensor (used with MiniMed 670G/780G)

For those of us wearing the Guardian sensor as part of a Medtronic pump system, the sensor follows the same rules as the pump — and they're treated as a unit at security.

You can continue to wear your insulin pump or continuous glucose monitor (CGM) only while going through common security systems such as an airport metal detector, as it will not harm the device or trigger an alarm.

If you choose to go through an airport body scanner, you must remove your insulin pump and Guardian (sensor and transmitter). Since removing a Guardian sensor mid-trip isn't something you want to do, requesting the pat-down is always the right call.

This is the setup I navigate now, and it requires the most proactive approach at security of the three CGMs covered here. I always inform the TSA officer before screening that I'm wearing both a pump and a sensor, that neither can go through the body scanner, and that I'm requesting a pat-down.

Having the Medtronic Airport Information Card ready to show makes this conversation much quicker.

Summary for Medtronic Guardian:

• ✅ Metal detectors — safe
• ❌ Full-body scanners — avoid; request pat-down
• ❌ X-ray baggage machines — avoid
• ✅ Hand-wanding and pat-down — recommended approach

👉 Of course, CGMs are just one part of the picture when it comes to navigating airport security with diabetes. From insulin and needles to glucose meters and emergency kits, there's a lot more to know about what you can and can't bring through the checkpoint. Our complete guide on TSA Rules for Diabetic Travelers covers everything — so you know exactly what to expect before you even get to the airport.

A Note for Pump Users Wearing Both a Pump and a CGM

If you're wearing an insulin pump and a CGM sensor simultaneously — which many of us are — you're essentially navigating two sets of manufacturer guidelines at once.

💡 The practical approach I use: treat both devices together as one system, and apply the most conservative rule that applies to either. If your pump shouldn't go through the full-body scanner, request a pat-down regardless of what your CGM manufacturer says — you can't disconnect the sensor to send it through separately while keeping the pump on your body. Inform the TSA officer about both devices before screening begins, and request a single pat-down that covers everything.

What to Say at the Security Checkpoint

This is the part that used to make me most nervous — and now it's completely automatic. Here's exactly what I say:

"Hi, I'm wearing a continuous glucose monitor and an insulin pump — both are medical devices that can't go through the body scanner. Can I request a pat-down instead?"

That's it. Most TSA officers respond immediately and efficiently. Occasionally you'll get someone less familiar with CGMs, and that's when having your manufacturer's documentation or a diabetes travel letter helps. But in my experience, the conversation is almost always quick and straightforward.

A few additional tips that have made my security experience smoother over the years:

• Tell the officer before you reach the scanner, not at it. Stopping in front of a full-body scanner after the person behind you has already started moving creates unnecessary pressure. I flag it as soon as I reach the officer who's directing people to the scanner.
• Keep extra sensors and receivers in your carry-on, not your checked luggage. Regardless of what the X-ray rules say for your sensor model, I'd always keep spares with you. Lost checked luggage with no backup sensors is a situation worth avoiding.
• Download your manufacturer's medical device documentation before you travel. Dexcom offers a "Notice of Medical Device" letter; Medtronic provides an Airport Information Card. Having these on your phone takes seconds and can resolve any confusion at the checkpoint instantly.
• If in doubt, request a pat-down. It's always available, it protects your device, and it's your right. No explanation needed beyond "I'd prefer a pat-down please."

👉 Between long layovers, hot arrival cities, and hotel fridges you can't always trust, there's a lot that can go wrong between leaving home and reaching your destination. My guide on How I Keep My Insulin Cool When Traveling covers everything I've learned from years of doing exactly that — so your insulin arrives in the same condition it left in.

FAQs About CGMs at Airport Security

• Can I wear my CGM through airport security?

Yes. Most CGM sensors can be worn through walk-through metal detectors without any issue. Full-body scanners are where the rules vary — the Dexcom G7 is cleared for AIT body scanners, while the FreeStyle Libre 2/3 and Medtronic Guardian should avoid certain scanner types. When in doubt, request a pat-down — it's always available and always safe.

• Can CGMs go through X-ray machines?

Most manufacturers advise against putting CGM sensors, transmitters, or receivers through X-ray baggage machines. The Dexcom G7 is an exception — extra sensors and the receiver can safely go through carry-on luggage X-ray scanning. For Freestyle Libre and Medtronic Guardian, request a visual inspection of your supplies instead.

• Do I need to remove my CGM at airport security?

No — you should not be asked to remove your CGM sensor, as it is inserted under the skin and cannot be removed without ending its wear session. If you're asked to remove it, politely explain this and request a pat-down alternative instead. If the officer is unhelpful, ask for a Passenger Support Specialist.

• Do I need a doctor's letter to fly with a CGM?

No — TSA does not require documentation for domestic US flights. However, carrying your manufacturer's medical device documentation or a diabetes travel letter is recommended, especially for international travel. Dexcom provides a downloadable "Notice of Medical Device" letter; Medtronic provides an Airport Information Card for the MiniMed system.

• Can CGM receivers and spare sensors go through X-ray baggage scanners?

For the Dexcom G7, yes — spare sensors and the receiver can safely go through carry-on luggage X-ray scanning. For Dexcom G6, FreeStyle Libre, and Medtronic Guardian, request a visual inspection of spare sensors and receivers rather than putting them through the X-ray machine.

💬 We’d Love to Hear From You

Have you had a memorable — or frustrating — experience navigating airport security with your CGM?

Drop it in the comments. The more we share as a community, the better prepared we all are.