If you're currently deciding whether to switch from Dexcom G6 to G7, or simply want to know what the new sensor offers in practice: here's my experience report. I'm Sonja from Zuckerschmuck, I've lived with type 1 diabetes for 37 years, and after several years on Dexcom G6, I was able to test the G7. I currently use Dexcom G6 plus Mylife Ypsopump in a loop with CamAPS fx.
Plus, at the end of the article, an outlook on the brand new Dexcom G7 15 Day, which has been available in the USA since December 2025 and is awaiting its CE Mark approval for the EU.
At a glance: the most important specs of the Dexcom G7
The data from the manufacturer's information and approval studies:
- Sensor type: rtCGM (= Real-Time Continuous Glucose Monitoring, continuous glucose measurement with live display) [2]
- Sensor size: about 60 percent smaller than the G6, about three stacked 2-euro coins
- Design: sensor and transmitter are combined in a single all-in-one component (the G6 had two separate parts) [3]
- Wear time: 10 days plus 12 hours grace period at the end
- Warm-up period: 30 minutes (the G6 had 2 hours) [3]
- Measurement interval: every 5 minutes
- Water resistance (according to manufacturer): up to 2.4 meters, up to 24 hours
- App: Dexcom G7 App for iOS and Android, plus direct Apple Watch connection without iPhone bridge (regional)
- Data sharing: up to 10 followers via Dexcom Share
- Minimum age according to approval: 2 years
- Hypoglycemia warning: up to 20 minutes in advance ("Urgent Low Soon" function, according to manufacturer)
- Accuracy (MARD from approval study): 8.2 percent on the upper arm, 9.1 percent on the abdomen [1]
- Available in Germany since: 2022
How does the Dexcom G7 work?
The G7 measures glucose levels in the subcutaneous fatty tissue and transmits the values every 5 minutes via Bluetooth directly to your smartphone, Apple Watch, or optional receiver. Unlike the G6, you no longer need a separate transmitter. The sensor and transmitter are connected at the factory and are disposed of together at the end of the session or sent to the manufacturer's recycling program.
The method is recognized as evidence-based therapy support by the German Diabetes Association in its 2024 practice recommendations [2]. How you integrate the G7 values into your therapy is up to your diabetologist. The sensor does not replace medical advice.
G6 or G7: what specifically changes
A direct comparison of the most important practical differences:
| Feature | Dexcom G6 | Dexcom G7 |
|---|---|---|
| Design | Sensor plus separate transmitter | All-in-One (sensor and transmitter in one component) |
| Sensor size | approx. 4.5 cm diameter | about 60 percent smaller |
| Warm-up period | 2 hours | 30 minutes |
| Wear time | 10 days | 10 days plus 12 hours grace period |
| Insertion site (officially) | Abdomen (adults), upper buttocks (children aged 2 and over) | Upper arm back officially approved ex-factory, plus abdomen and upper buttocks |
| App display | iOS and Android | iOS and Android, plus direct Apple Watch connection without smartphone bridge (regional) |
| Accuracy (MARD) | approx. 9.0 percent (manufacturer's specification) | 8.2 percent on the upper arm, 9.1 percent on the abdomen (approval study) [1] |
| Hypoglycemia prediction "Urgent Low Soon" | available | available, plus extended trend displays |
| Loop compatibility | established (CamAPS fx, Tandem Control-IQ, t:slim) | gradual expansion, as of 2026 compatible with CamAPS fx, Omnipod 5, Tandem t:slim |
| In Germany since | 2018 | 2022 |
My impression after extensive testing with the Dexcom G7
Three things that immediately struck me after switching from the G6 to the G7 in everyday life:
The shorter warm-up phase is a real comfort gain. With the G6, the 2-hour warm-up phase after each sensor change was a window of time during which I had to be particularly attentive. Here, I regularly ruined my good blood sugar values because the Mylife Cam APS loop couldn't work without a CGM value. The 30 minutes with the G7, on the other hand, are barely noticeable; I can integrate the change into my day almost incidentally and am rewarded with continuously calculable glucose profiles.
The smaller design is less bothersome under clothing. The G6 sometimes created a pressure point or detached under tight-fitting clothing. The G7 is significantly more discreet, especially under sportswear or on the upper arm. It simply looks better; for me, as the founder of Zuckerschmuck, the aesthetics of CGM sensors and insulin pumps are always personally important.
Various possible wearing locations for the G7. With the G7, the insertion site on the upper arm, abdomen, or buttocks (for users aged 2 to 6 years) is approved ex-factory, and the sensor size is also precisely optimized for these sites.
What remains: the loop integration with Ypsopump and CamAPS fx should work shortly. The hypoglycemia warning "Urgent Low Soon" will certainly work just as precisely for me as it did with the G6. The accuracy is minimally better in everyday life, but not dramatically different, which is consistent with the approval studies (MARD 8.2 percent G7 vs. approx. 9 percent G6) [1] [4].
Important: this is my personal impression, not a therapeutic recommendation. Decisions regarding changes should be made in consultation with your diabetologist.
What do the studies say about accuracy?
In the pivotal G7 approval study by Welsh et al. (2022, multicenter clinical trial in adults with diabetes), the MARD value (= Mean Absolute Relative Difference, a standard measure for sensor accuracy compared to laboratory blood glucose) was 8.2 percent on the upper arm and 9.1 percent on the abdomen [1]. A direct comparison study from 2024 tested the G7 and G6 under the same conditions: the G7 showed a moderate improvement in most metrics, especially in challenging clinical situations such as intensive care [4].
For everyday diabetes therapy, this means: the difference is measurable, but not dramatic. Both sensors are clinically validated and are reimbursed by health insurance companies in Germany if the medical requirements are met.
New since December 2025: Dexcom G7 15 Day (USA Launch)
In November 2025, Dexcom announced the next generation: the Dexcom G7 15 Day. Since December 1, 2025, it has been available in the USA through DME providers (Durable Medical Equipment) and reimbursable for Medicare beneficiaries [5]. In the EU and Germany, the G7 15 Day is not yet approved as of May 2026; CE Mark certification is pending.
How does the G7 15 Day differ from the regular G7?
- Wear duration: 15.5 days including 12 hours grace period (vs. 10.5 days for the G7). That's about 50 percent more wear time per sensor [5].
- Accuracy (MARD): 8.0 percent (vs. 8.2 percent for the G7) [5]. Slightly more precise according to approval data.
- Age approval: from 18 years (vs. from 2 years for the G7). For children and adolescents between 2 and 18, the regular G7 remains the recommended choice. Dexcom itself states it this way: the regular G7 is, according to the manufacturer, "the most accurate CGM system on the market for this age group" [5].
What else remains identical: all G7 functions such as direct Apple Watch connection, activity and meal logging, new medication logging, Dexcom Clarity integration, 12-hour grace period for sensor changes, "Urgent Low Soon" prediction. Regarding loop compatibility: at the US market launch, the G7 15 Day works with the iLet Bionic Pancreas and with Omnipod 5; integration with Tandem t:slim is in progress according to the manufacturer [5].
Practical assessment from my perspective: if the G7 15 Day becomes available in the EU (timing currently unknown), it is, in my opinion, the next sensible step for adults. 50 percent fewer sensor changes per month means: less effort, less adhesive site stress, less packaging waste. Until then, the regular G7 remains the right choice for me and for Diabuddies in the DACH region. As soon as CE approval and health insurance reimbursement are in place, I will review it again.
Where can I insert the Dexcom G7?
Unlike the G6, the upper arm back is approved ex-factory as an insertion site for the G7, which many Diabuddies already practiced off-label anyway. Also approved for adults: abdomen. For children aged 2 and over: upper arm and upper buttocks [3].
Which accessories fit the Dexcom G7?
We have systematically built up the G7 accessory range over the past few years. Four main categories cover the most common everyday questions:
Wearing the sensor visibly. Those who want to show off their sensor will find our colorful sensor stickers for the Dexcom G7. They fit perfectly on the all-in-one component and transform the gray sensor into a small work of art.
Discreetly concealing the sensor. Those who prefer to wear the sensor discreetly can opt for the decorative tapes for the G7 in skin-colored or subtle tones. These are available as edge tapes with a "hole," i.e., for bordering the sensor and concealing the factory adhesive, or for covering as an overpatch. A secure tape change of the overpatches is safely possible at any time during the G7's runtime with our permanently reusable tape cover protective caps and protects the G7 from tearing off during tape changes.
How to tape in difficult insertion sites? If your sensor is difficult to reach in some places and you have trouble applying the tape, our Tapeguard adhesive aid for the G7 helps, which acts as a "frame" for applying the border tape: you conveniently stick the tape onto the Tapeguard and then place the Tapeguard with the tape over your G7.
Reusable flexible G7 armbands for the upper arm. For active Diabuddies, athletes, or diabetic kids, we have elastic armbands with sensor holders for the G7. This is especially helpful for swimming, sports, playing, or under tight clothing. Advantage: they are only temporarily wearable and permanently reusable.
Receiver and reader. Those who use the optional Dexcom receiver or reader will find reader cases, screen protectors, and stickers for the receiver with us.
The full range of G7 accessories can be found bundled under Dexcom G7.
What to do for plaster allergy under the G7?
Even with the new G7, some Diabuddies from our community report itchy or reddened skin areas under the adhesive surface, especially after several sensor changes. What helps most people: skin protection wipes (for example, SKIN PREP or SECURA) as an invisible barrier between the adhesive and the skin. Alternatively, there are skin protection sprays, which also form a transparent barrier between the sensor and the skin. Skin protection sprays also increase the regular adhesive strength of the G7 sensor patch as a side effect due to their sticky properties. If all else fails, there are still underpatches for the G7 as a physical barrier between the skin and the sensor. The strongest barrier against skin irritations from CGM sensors are silicone-like skin protection plates, which can be cut to shape with scissors and glued between the sensor and the skin.
I have written a detailed guide with all tips in the article Help with skin irritations caused by sensors. In the shop, you will find the right material in the skin protection category.
Frequently Asked Questions about the Dexcom G7
Is it worth switching from G6 to G7?
From my perspective, yes, primarily due to the shorter warm-up phase (30 minutes instead of 2 hours), the smaller design, and the ex-factory approved upper arm insertion site. Those with an established G6 loop setup should coordinate the switch with their diabetologist and the loop app compatibility.
How long does a Dexcom G7 sensor last?
Officially 10 days, plus 12 hours grace period at the end. The even newer Dexcom G7 15 Day extends this to 15.5 days, but is only available in the USA as of May 2026.
What is the difference between Dexcom G7 and Dexcom G7 15 Day?
Three points: wear duration (15.5 instead of 10.5 days), MARD accuracy (8.0 instead of 8.2 percent), age approval (from 18 instead of 2 years). Otherwise, both systems are identical in functions, alarms, and connectivity options [5]. For children and adolescents, the regular G7 remains the recommended choice.
Is the G7 15 Day already available in Germany?
As of May 2026: no. The G7 15 Day has been available in the USA via DME providers since December 1, 2025. CE Mark approval for the EU has not yet been granted according to public information. We will update this as soon as it changes.
Do I absolutely need a smartphone for the G7?
Practically yes, because the Dexcom G7 app is the primary receiver. There is an optional hardware receiver, but most users work with a smartphone. With the G7, there is also direct Apple Watch connection without an iPhone bridge, tiered regionally.
Where can I insert the G7?
Officially approved for adults: upper arm back (new with the G7) and abdomen. For children aged 2 and over, also the upper buttocks. With the G6, the upper arm was still off-label practice and is standard with the G7 ex-factory.
What to do for plaster allergy?
Skin protection wipes (SKIN PREP, SECURA) as a barrier between adhesive and skin help many Diabuddies. In case of persistent skin irritations or suspicion of an allergy, please consult a doctor. More practical tips in the article Help with skin irritations caused by sensors.
My personal conclusion on the Dexcom G7:
I personally look forward to when the G7 works with my Ypsopump or the Mylife Cam APS fx. The advantages for me are primarily the smaller design of the sensor, the shorter lead time of only 30 minutes, the overlapping grace period of 12 hours, and the ability to pair a smartwatch without needing the smartphone.
Sources
- Welsh JB, Gao P, Lehigh A, et al. Accuracy, Utilization, and Effectiveness Comparisons of Different Continuous Glucose Monitoring Systems. Diabetes Technology & Therapeutics 2022. Pivotal G7 approval study. Available at: PMC9208857 (Welsh et al. 2022).
- Freckmann G, Eichenlaub M, Pleus S, et al. Glukosemessung und -kontrolle bei Patienten mit Typ-1- oder Typ-2-Diabetes. Diabetologie und Stoffwechsel 2024;19(S 02). Practice recommendations of the German Diabetes Association. Available at: DDG Practice Recommendations 2024 (PDF).
- Dexcom Inc. Dexcom G7 CGM System Product Information Germany. Available at: de.provider.dexcom.com/produkte/dexcom-g7.
- Welsh JB, Psavko S, Zhang X, Gao P, Balo AK. Comparisons of Fifth-, Sixth-, and Seventh-Generation Continuous Glucose Monitoring Systems. Journal of Diabetes Science and Technology 2024;18(4). Available at: JDST 2024 (Welsh et al.).
- Dexcom Inc. Dexcom G7 15 Day Sensor Receives FDA Clearance. Press release November 2025, market launch December 1, 2025 in the USA via DME providers. Available at: dexcom.com/g7-15-day-sensor-fda and dexcom.com G7 15 Day Overview.
Note: This article combines manufacturer specifications, study data, and my personal experience as a G7 user and does not replace medical advice. For questions about sensor changes, therapy adjustments, or persistent skin irritations, please contact your diabetologist. In medical emergencies: call 911 (or your local emergency number).
Best regards,
your Sonja
