| Wear Time | 15 days + 8-hour grace period |
| MARD Accuracy | ~8.2% |
| Warm-Up Time | ~30 minutes |
| Calibration | Not required (factory calibrated) |
| Water Resistance | IP28 β up to 8 ft / 2.4 m for 24 hours |
| Transmitter | Integrated disposable (all-in-one) |
| Bluetooth Range | ~6 metres (20 ft) |
| Reading Interval | Every 5 minutes |
| Compatible OS | iOS 15+ / Android 9+ |
| Pack Size | 1 sensor per pack |
Key Takeaways
- The Dexcom G7 15-day sensor provides up to 15 days of continuous wear plus an 8-hour grace period β the longest of any Dexcom sensor to date.
- No fingerstick calibration required; factory-calibrated out of the box.
- MARD (Mean Absolute Relative Difference) of approximately 8.2%, maintaining clinical-grade accuracy across the full wear period.
- Works with the Dexcom G7 app (iOS & Android), Dexcom receiver, and integrates with select insulin pumps.
- Available as a 1-pack from MDS Diabetes.
What Is the Dexcom G7 15-Day Sensor?
The Dexcom G7 15-Day sensor is an extended-wear continuous glucose monitor (CGM) designed for people with diabetes who want fewer sensor changes and longer uninterrupted monitoring. It is an evolution of the standard Dexcom G7 (10-day) sensor, sharing the same compact all-in-one design β transmitter and sensor integrated into a single disposable unit β but certified for an additional five days of wear.
The sensor measures interstitial glucose every five minutes and sends readings wirelessly to a compatible display device, alerting users to highs, lows, and rate-of-change trends in real time.
Key Specifications
| Specification | Dexcom G7 15-Day | Dexcom G7 Standard |
|---|---|---|
| Approved wear time | 15 days + 8-hr grace | 10 days + 12-hr grace |
| Warm-up period | ~30 minutes | ~30 minutes |
| MARD | ~8.2% | ~8.2% |
| Calibration | None required | None required |
| Water resistance | IP28 (up to 8 ft / 2.4 m for 24 hrs) | IP28 |
| Transmitter | Integrated (disposable) | Integrated (disposable) |
| Bluetooth range | ~6 metres (20 ft) | ~6 metres (20 ft) |
| Sensor size | 60% smaller than G6 | 60% smaller than G6 |
| Insertion site | Abdomen or upper buttocks | Abdomen or upper buttocks |
How It Works
A small flexible filament is inserted just beneath the skin using an integrated one-touch applicator. The filament contains an electrochemical biosensor that measures glucose in the interstitial fluid. Readings are transmitted via Bluetooth Low Energy to the Dexcom G7 app or receiver every five minutes. On-board algorithms convert the raw signal into a glucose value and calculate rate-of-change arrows to help users anticipate trends.
Grace Period Explained
After 15 days, the sensor enters an 8-hour grace period before it stops functioning. Users can apply a new sensor during this window without a coverage gap β useful for overnight continuity.
Accuracy & Clinical Evidence
The G7 15-day sensor maintains an MARD of ~8.2%, consistent with the 10-day version. Clinical studies demonstrate that accuracy does not degrade meaningfully in days 11β15, making the extended wear medically reliable. The sensor meets FDA iCGM requirements, enabling integration with automated insulin delivery (AID) systems.
Compatible Devices & Integrations
- Apps: Dexcom G7 app (iOS 15+ / Android 9+), Dexcom Follow, Dexcom Clarity
- Receivers: Dexcom G7 touchscreen receiver
- AID systems: Tandem t:slim X2 (select markets), Omnipod 5
- Apple Watch: Displays readings on-wrist via G7 app
- Third-party: Apple Health, Google Health Connect
Who Should Use the 15-Day Sensor?
- People who find frequent sensor changes disruptive to daily life or sleep.
- Athletes and active users who want a sensor that endures longer through sweat and activity.
- Those with skin sensitivity seeking to reduce adhesive application frequency.
- Travellers wanting fewer supplies to carry on extended trips.
Application Tips for Maximum Wear
- Clean the site with alcohol and allow it to dry fully before application.
- Use a skin prep wipe (e.g., Skin-Tac) to boost adhesion, especially in humid climates.
- Rotate insertion sites each session to avoid tissue buildup.
- Avoid waistbands and areas with frequent bending.
- Overpatch if needed β transparent dressings can extend adhesion through the full 15 days.
Where to Buy
The Dexcom G7 15-Day sensor is available as a convenient 1-pack directly from MDS Diabetes, a trusted supplier of CGM technology with fast shipping and expert support for people managing diabetes.