What's new in the Dexcom G7?
The G7 launched in 2023 as a significant upgrade over the G6, and Dexcom has continued to refine it through 2025 and into 2026. The most meaningful improvements over its predecessor:
60% smaller sensor. The G7 combines the sensor and transmitter into a single disposable unit — no more separate transmitter to charge and reuse. The result is a sensor that's noticeably smaller and more discreet than the G6.
30-minute warmup. The G6 required two hours before readings began. The G7 cuts that to 30 minutes — a dramatic improvement for everyday use and sensor changes.
12-hour grace period. When a sensor expires after 10 days, you have a 12-hour window before it stops working. This is a practical quality-of-life improvement that eliminates the urgency of having a replacement sensor immediately on hand.
Improved accuracy. MARD of 8.2%, down from 9% on the G6. Not a massive leap, but a consistent improvement across all patient populations studied.
In 2025, Dexcom also launched the G7 15-Day — an extended-wear version cleared for 15 days, bringing it in line with the FreeStyle Libre 3 on wear time.
Accuracy — How reliable is it?
Accuracy is the most important metric for a CGM, and the G7 performs well. In clinical trials, it achieved a Mean Absolute Relative Difference (MARD) of 8.2% — meaning readings are within 8.2% of a reference blood glucose value on average.
In real-world use, the G7 is remarkably consistent. Compression lows during sleep — a common complaint with older CGMs — occur less frequently. The G7 is also the only CGM cleared for use during pregnancy, reflecting its strong clinical accuracy profile.
One note: all CGMs measure interstitial fluid glucose, not blood glucose directly. This introduces a natural 5–15 minute lag behind actual blood glucose levels. During rapid glucose changes — a fast-acting meal or vigorous exercise — readings may lag behind reality. The G7's trend arrows help account for this.
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. Most users place it on the back of the upper arm, though the abdomen and upper buttocks (for children) are also approved sites.
Application uses a one-touch auto-applicator. Insertion is quick and, for most people, nearly painless. The adhesive patch is designed to last the full 10 days through showering, sweating, and everyday activity.
Water resistance: rated for submersion up to 2.4 meters for up to 24 hours. Swimming, showering, and water sports are all fine.
Adhesive issues are the most common complaint. Some users experience skin irritation or adhesive failure before day 10, particularly in hot climates or with active lifestyles. Aftermarket adhesive patches (widely available on Amazon) solve this for most people.
App experience and integrations
The Dexcom G7 app is the most mature CGM app available. It's clean, reliable, and has been refined over years of real-world use. Key features:
Real-time readings every 5 minutes with trend arrows showing direction and rate of change. The app stores 90 days of glucose history and generates reports your care team can review.
Customizable alerts: high and low alerts, urgent low alerts, rapid rise/fall alerts, and a configurable quiet mode. The alert system is the most comprehensive of any CGM and is a meaningful advantage for people managing tight glucose control.
Apple Watch support: the G7 displays readings directly on Apple Watch — the only CGM with direct (non-third-party) Watch support as of 2026.
Share feature: send real-time readings to up to 10 followers via the Dexcom Follow app. Widely used by parents of children with T1D and partners who want to monitor each other.
Third-party integrations: Garmin, Fitbit, most major insulin pumps, and Control-IQ / Omnipod 5 closed-loop systems. The G7 has the broadest integration ecosystem of any CGM.
How much does the Dexcom G7 cost?
Without insurance: approximately $350–400 for a box of 3 sensors (a 30-day supply). This works out to roughly $115–135 per sensor, or $350+ per month.
With insurance: most covered patients pay significantly less. Medicare covers CGM for all insulin-using diabetes patients. Most private insurance plans cover CGM for Type 1 and for Type 2 patients on insulin. Dexcom reports that most covered patients pay $20 or less per month.
FSA/HSA eligible: yes. If you have a Flexible Spending Account or Health Savings Account, G7 sensors qualify.
Always check insurance coverage before paying out of pocket. If you have any form of diabetes diagnosis and use insulin, there's a good chance your insurer covers CGM — often at minimal cost to you. Your prescriber's office can help navigate prior authorization.
Dexcom G7 vs FreeStyle Libre 3
These two devices dominate the prescription CGM market. Here's how they compare on the metrics that matter most:
| Feature | Dexcom G7 | FreeStyle Libre 3 |
|---|---|---|
| MARD accuracy | 8.2% | 7.8% |
| Wear time | 10 days (15-day version available) | 15 days |
| Warmup time | 30 minutes | 60 minutes |
| Reading frequency | Every 5 minutes | Every 1 minute |
| Apple Watch display | Yes (native) | No |
| Closed-loop AID | Broad support | Limited |
| Cost (uninsured) | ~$350/month | ~$130–200/month |
| Sensor size | Small | Smallest available |
Bottom line: The Libre 3 wins on accuracy, wear time, and cost. The G7 wins on Apple Watch support, closed-loop compatibility, and alert system depth. The right choice depends entirely on how you manage your diabetes.
Who should buy the Dexcom G7?
- Have Type 1 diabetes and use or plan to use a closed-loop AID system
- Want Apple Watch glucose display
- Need the most comprehensive alert and alarm system
- Use or plan to use Control-IQ, Omnipod 5, or Loop
- Want the broadest third-party app integrations
- Are pregnant with diabetes (only CGM cleared for pregnancy)
- You don't use a closed-loop insulin system
- Cost is a primary concern (Libre is cheaper uninsured)
- You prioritize longest wear time per sensor
- You have Type 2 diabetes not requiring AID systems
- You don't use Apple Watch
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% |
| 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 | Upper arm, abdomen, upper buttocks (children) |
| App compatibility | iOS 15+, Android 9+ |
| Apple Watch support | Yes (native) |
| Share capability | Up to 10 followers |
| Prescription required | Yes |
| Cleared for pregnancy | Yes |