For people with diabetes who rely on continuous glucose monitoring (CGM) every day, one of the first questions that comes up when scheduling a mammogram is: do I have to take off my CGM?

It seems straightforward, but the answer actually touches on device safety, image quality, and blood glucose management all at once.

As a SIBIONICS CGM user, knowing what to expect before your appointment can make the day much smoother.

This article draws on FDA guidance, official manufacturer documentation, and medical institution recommendations to give you a clear, reliable answer on cgm and mammogram.

What Happens To A CGM During A Mammogram?

A mammogram uses low-dose X-rays to create images of breast tissue and is one of the most important tools for breast cancer screening.

According to the National Cancer Institute (NCI), mammography uses low-dose X-rays and is regulated under the Mammography Quality Standards Act (MQSA) to ensure radiation levels meet safety standards across all certified facilities [1].

A CGM sensor is a wearable device that contains metal components and electronic circuitry.

When placed within the X-ray field, these parts can produce imaging artifacts - shadows or distortions from non-tissue objects that may interfere with a radiologist's ability to accurately read the image.

Ionizing radiation may also affect the electronic components inside a CGM sensor, potentially compromising measurement accuracy.

This is why most CGM manufacturers include clear guidance on imaging procedures in their official user documentation.

Do I Need to Remove My CGM Before A Mammogram?

Whether you can keep your CGM on during a mammogram depends on your specific brand and model.

The table below provides an objective summary of the current official positions from major CGM brands:

Brand/Model	During Mammogram	Official Source
SIBIONICS GS3	❌ Must be removed	SIBIONICS GS3 Official User Guide
Dexcom G6/G7	⚠️ Must be removed for MRI/CT — consult doctor for mammogram	Dexcom Official FAQ [3]
FreeStyle Libre 2/2 Plus/3/3 Plus	✅ Can be safely worn	Abbott Official Documentation (support.freestyle.abbott)

The SIBIONICS GS3 official user guide explicitly states that the device must be removed before X-ray examinations - including mammograms - as well as CT scans and MRI procedures [2].

This is a clearly documented contraindication based on device safety and image quality requirements, and users should follow it strictly.

Some brands, such as FreeStyle Libre 2 and 3 series, have obtained FDA clearance for use during specific imaging procedures.

However, this is a brand-specific certification - it does not apply to all CGM devices.

If you have any uncertainty about your own device, contact the manufacturer directly or consult your healthcare provider.

Does CGM Placement Affect Mammogram Results?

Recommended CGM placement varies by brand - always refer to your device's official user guide.

For the SIBIONICS GS3, the manufacturer recommends placing the sensor cgm on the back of the upper arm, in the soft tissue area between the shoulder and the upper third of the arm.

This location is typically well away from the breast imaging zone and would not fall within the direct X-ray path under standard mammogram conditions.

That said, mammograms require the breast tissue to be compressed firmly between two imaging plates, which means your body position will shift during the exam.

If your CGM sensor is close to the imaging area, the radiology technologist may still ask you to remove it to ensure a clean, artifact-free image.

Even if the CGM system is not in the direct X-ray path, it may be exposed to trace amounts of scatter radiation.

While the scatter from a mammogram is very low, manufacturers have specific guidelines on whether their devices can safely operate in this environment — and those guidelines should be followed.

What Should You Do When Removing Your CGM For A Mammogram?

If your CGM needs to come off before the exam, a little planning ahead goes a long way in keeping your glucose monitoring on track.

Before the Mammogram

Start by reviewing your CGM device's official user guide to confirm whether removal is required and when.

Next, talk with your doctor or diabetes care team in advance. Let them know you have a mammogram coming up and ask about a monitoring plan for the gap period.

According to the American Diabetes Association (ADA) 2025 Standards of Care in Diabetes, continuous CGM data plays an important role in effective blood glucose management - bridging the gap with fingerstick testing is a practical approach during any brief monitoring interruption [4].

Prepare a fingerstick glucometer with enough lancets and test strips ahead of time.

Also let the radiology technologist know you wear a CGM when you arrive, so they can plan accordingly.

During the Mammogram

Once the CGM is removed, store the sensor and transmitter carefully to avoid compression or damage.

If your sensor is nearing the end of its wear period, you can plan to apply a fresh one after the exam.

Use your fingerstick glucometer as needed to maintain your usual monitoring routine.

A standard screening mammogram typically takes around 15 to 30 minutes, so the monitoring gap is manageable.

After the Mammogram

When the exam is done, reapply your CGM sensor according to your device's official instructions and recommended placement site.

If you use the SIBIONICS GS3, the manufacturer recommends placing the sensor on the back of the upper arm — refer to the official user guide for the full application steps.

Keep in mind that a newly applied sensor requires a warm-up and initialization period before it can deliver reliable readings.

Continue fingerstick testing during this window until your CGM returns to stable operation.

What If Your CGM Was Accidentally Left On During A Mammogram?

If you realized after the fact that your CGM was still on during the exam, here is how to respond:

First, try not to worry too much.

The NCI notes that mammography uses low-dose X-rays, and radiation exposure from routine screening is well below the threshold associated with health risks and no radiation remains in the body after the exam.

Next, check whether your CGM is still functioning normally. Compare your CGM reading to a fingerstick result.

If there is a significant discrepancy, or if the device is generating frequent alerts or failing to connect, contact your CGM manufacturer's customer support, explain what happened, and ask whether the sensor should be replaced.

Verdict: CGM And Mammogram What You Need To Know

Can you wear a cgm during a mammogram? The answer depends entirely on which device you use and what your manufacturer's official documentation says.

Situation	Recommended Action
Device manual requires removal	Follow strictly — prepare a glucometer as backup
Unsure whether removal is needed	Contact your manufacturer or consult your doctor
Device has imaging compatibility clearance	Follow that device's official guidelines
Device was accidentally left on	Cross-check readings — contact manufacturer if abnormal

For SIBIONICS GS3 users, the official user guide is clear: the device must be removed before X-ray examinations, including mammograms.

Communicate with your care team in advance, prepare a backup monitoring plan, and your appointment can go smoothly without interrupting your glucose management.

Over years of observing real-world CGM use in health management settings, we have seen many users encounter avoidable complications - from unclear imaging to sensor performance issues - simply because they were unaware of their device's contraindications.

Being informed and prepared is always the most effective approach.

According to the World Health Organization (WHO), the number of adults living with diabetes rose from 200 million in 1990 to 830 million in 2022 [5].

As CGM adoption continues to grow, more patients will face the practical challenge of coordinating device use with various medical procedures.

We hope this article helps you navigate that intersection with confidence.

FAQ

How long will I be without CGM data during a mammogram?

A standard screening mammogram typically takes 15 to 30 minutes.

Factor in the new sensor's warm-up time after reapplication. Overall, the monitoring gap is relatively short and manageable with fingerstick testing.

What should I use to monitor my glucose while my CGM is removed?

A fingerstick glucometer is the most reliable alternative during any CGM monitoring gap.

Prepare enough lancets and test strips in advance, and ask your doctor how frequently to check during the procedure window.

References

[1] National Cancer Institute. (2024). Mammograms. cancer.gov. https://www.cancer.gov/types/breast/mammograms-fact-sheet
[2] SIBIONICS. GS3 CGM System — Official Product Page & User Guide. Contraindications: Section 1.4 & 1.6.7. sibionicscgm.com. https://www.sibionicscgm.com/products/sibionics-gs3-cgm-continuous-glucose-monitoring-system
[3] Dexcom. Do I need to remove my Dexcom G6 sensor for certain procedures? dexcom.com. https://www.dexcom.com/en-us/faqs/do-i-need-to-remove-my-dexcom-g6-sensor-for-medical-procedures
[4] American Diabetes Association Professional Practice Committee. (2025). Standards of Care in Diabetes—2025. Diabetes Care, 48(Supplement_1), S1–S352. https://doi.org/10.2337/dc25-S001
[5] World Health Organization. (2024). Diabetes. WHO Fact Sheets. who.int. https://www.who.int/news-room/fact-sheets/detail/diabetes

Disclaimer

This article is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Author Info

This article was written by the SIBIONICS Professional Health Content Team. The author has years of research experience in CGM and diabetes management, helping users optimize their device experience through science-based practices.

Last Updated: April 13, 2026