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What's new in the Dexcom G7?
Original G7 and G6 are separate models. Compare their labeled warm-up, wear, hardware and compatibility requirements. The following describes G7 features:
Integrated sensor and transmitter. G7 combines these in one disposable unit. The earlier G6 transmitter was reused, not charged by the user.
30-minute warmup. The G6 required two hours before readings began. Original G7 has a 30-minute warm-up; follow model-specific startup and backup-monitoring instructions.
Original G7 has up to 10-day wear followed by a 12-hour grace period. Follow replacement and backup-monitoring instructions; the grace period does not eliminate the need to plan sensor changes.
The manufacturer reports study-specific accuracy figures for the G7. A difference from a separately studied G6 figure does not by itself establish improved accuracy across all users.
G7 15 Day is a separate adult model with up to 15-day wear plus a 12-hour grace period and a 60-minute warm-up. Original Libre 3 has up to 14-day wear; Plus is a distinct up-to-15-day model.
Accuracy — How reliable is it?
MARD is the mean absolute relative difference between sensor readings and reference measurements in a particular study. It is an average across paired readings, not an error bound for each reading or a direct clinical ranking across separate studies.
Accuracy depends on the device, glucose range and measurement conditions. A study-wide MARD does not guarantee the accuracy of an individual reading. Follow the current instructions for your specific device and discuss clinical decisions with your healthcare professional.
CGMs estimate interstitial glucose. Readings may differ from simultaneous blood measurements, especially during rapid change. Lag varies; trend arrows do not remove it. Follow the instructions when readings and symptoms disagree.
Design, comfort, and wearability
The G7 sensor is small — roughly the size of a large coin — and sits flush against the skin when applied correctly. It's approved for the back of the upper arm (ages 2+), with the upper buttocks as an additional site for children ages 2–6. Unlike the earlier G6, the abdomen is not an approved G7 wear site in the US.
Application uses a one-touch auto-applicator. Follow the current G7 application, placement and adhesion instructions; individual insertion and skin experiences vary.
The G7 sensor is rated for water exposure up to 2.4 meters for up to 24 hours under its labeled conditions. This is not a guarantee for every water sport; follow the model instructions.
Adhesive irritation and early detachment can occur. Follow the manufacturer’s instructions and discuss skin reactions with a healthcare professional. Extra patches do not guarantee a solution and may introduce different adhesives.
App experience and integrations
The Dexcom G7 app displays sensor glucose and offers model-specific reporting and sharing features. Check current phone, watch and software compatibility with Dexcom. Features described below:
G7 supplies readings every five minutes and model-specific trend arrows. Use current Dexcom documentation for reporting and storage features; a trend arrow does not remove interstitial lag.
G7 provides configurable alerts, including an urgent-low alert. Follow current instructions and alert settings; alarms do not guarantee detection or prevention of every event.
G7 supports Direct to Watch on compatible Apple Watches. It is not an exclusive feature: the June 2026 Stelo FDA clearance also includes Direct to Watch. Confirm current app availability, device compatibility and connection requirements with Dexcom.
Share feature: send real-time readings to up to 10 followers via the Dexcom Follow app. Confirm the follower setup, sharing and connectivity requirements with Dexcom.
Confirm each integration by exact model and software. Tandem lists G7 and G7 15 Day compatibility; Omnipod provides its own current sensor list. Garmin display is secondary and requires the supported phone and network connection. Fitbit activity import is not proof of glucose display on Fitbit.
How much does the Dexcom G7 cost?
Without insurance: check the supplier’s exact pack quantity and purchase price. Original G7 supports up to 10 days of wear plus a 12-hour grace period per sensor; maximum wear does not guarantee uninterrupted calendar-month coverage.
With insurance: your payment depends on coverage and cost-sharing terms. Medicare covers CGM when its coverage criteria are met (including insulin treatment or documented problematic hypoglycemia), and private plans set their own criteria; many cover CGM for some people with type 1 diabetes or insulin-treated type 2 diabetes. Out-of-pocket cost depends on your plan — ask your insurer and Dexcom.
Ask your plan administrator whether the specific purchase qualifies for HSA/FSA reimbursement. FDA clearance and OTC availability alone do not establish eligibility.
Coverage depends on the exact device, plan, documentation and supplier. Medicare requires all applicable criteria, including diabetes, a prescription, training, FDA-consistent use, required visits and insulin treatment or documented problematic hypoglycemia. Ask your insurer and prescriber about your situation.
Dexcom G7 vs FreeStyle Libre 3
The following compares original Dexcom G7 and original FreeStyle Libre 3 by their named features and study-specific results:
| Feature | Dexcom G7 | FreeStyle Libre 3 |
|---|---|---|
| MARD accuracy | 8.2% adult arm study | 7.8% ages ≥6, YSI |
| Wear time | 10 days | 14 days |
| Warmup time | 30 minutes | 60 minutes |
| Reading frequency | Every 5 minutes | Every 1 minute |
| Apple Watch display | Yes (native) | No |
| Closed-loop AID | Check exact pump/software | Original Libre 3 is distinct from Plus |
| Cost (uninsured) | Check price | Check price |
| Sensor size | Integrated | Integrated |
Published MARD figures come from separate manufacturer studies and do not establish which device is more accurate. Choose a device based on the features you need with advice from your healthcare professional, and check manufacturers for current prices.
What the Dexcom G7 lists
- People with diabetes, ages 2+.
- Sensor wear is up to 10 days plus a 12-hour grace period, with a 30-minute warm-up (Dexcom).
- Compatibility with insulin pumps and AID systems is model- and software-specific; check Dexcom's compatibility list.
- G7 is a prescription CGM.
- G7 15 Day is a separate model indicated for adults 18 and older, with a 60-minute warm-up (Dexcom).
- Pregnancy use is device- and model-specific; check the labeling of the model prescribed.
CGM selection for diabetes management should always involve your endocrinologist or diabetes care provider. Insurance coverage, pump compatibility, and your clinical needs all affect which device is right for you.
Dexcom G7 full specs
| MARD accuracy | 8.2% adult arm study; not pediatric pooled result |
| Wear time | 10 days + 12hr grace period |
| Warmup time | 30 minutes |
| Reading interval | Every 5 minutes |
| Calibration | Not required (factory calibrated) |
| Water resistance | 2.4m / 24 hours |
| Approved ages | 2 years and older |
| Wear sites | Back of upper arm (ages 2+); upper buttocks also allowed for ages 2–6. Abdomen is not an approved G7 site in the US. |
| App compatibility | Use Dexcom’s current model-specific compatibility list |
| Apple Watch support | Yes (native) |
| Share capability | Up to 10 followers |
| Prescription required | Yes |
| Pregnancy use | Dexcom states G7 can be used in pregnancy; this is manufacturer guidance, not a separately verified pregnancy clearance |