Dexcom G7

CGM Device Guide

Dexcom G7

Two adults at a DAFNE refresher last month, both on Dexcom but different generations. The G6 sat under a transmitter clip and asked for two calibrations a day. The G7 needed neither. Same blood, similar lines, no daily fingerprick. The G7 is what most of the cohort is using now.

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Framework status

5/5
Framework
All five framework criteria met
iCGM designation: Yes (G7 15-day FDA; G7 10-day meets iCGM thresholds)
±20/20
95.3%
Arm placement
Outside ±40/40
<0.5%
Safety band
Wear
10 days
+ 12h grace
✓ T1D included. Studied in people with type 1 diabetes.
✓ Meal challenge included. Rapid glucose rises tested, not just stable periods.
✓ Hypoglycaemia challenge included. Accuracy tested in the low range.
✓ Venous blood reference (YSI). The gold-standard reference method.
✓ Population and indication match. Adults and children from age 2.

Data sufficiency: Met. n=316, 619 sensors, 77,774 matched reference pairs (Garg et al., 2022).

Device specifications

The headline numbers sit in the framework card above. The full device profile is here for anyone who wants the detail.

Full device profile

Manufacturer: Dexcom. Wear duration: 10 days plus 12-hour grace period (standard G7). ±20/20 agreement: 95.3% arm, 93.2% abdomen. Outside ±40/40: below 1% of readings (the black-swan zone, see the accuracy page). Calibration: not required, factory-calibrated; optional calibration accepted. Transmitter: all-in-one, integrated into the disposable sensor pod. Readings: every 5 minutes, continuous Bluetooth. Display: Dexcom app on iOS and Android, plus an optional standalone receiver. Indication: non-adjunctive (no confirmatory finger prick required for insulin dosing). Age indication: 2 years and older (buttock placement option for ages 2 to 6).

An adult wearing a Dexcom G7 sensor on the back of her arm, looking at a mountain landscape at golden hour
The Dexcom G7 in everyday wear, upper-arm placement. Image courtesy of Dexcom UK.
Dexcom G7 sensor pod, applicator, and receiver shown together against a white background
The G7 family. The all-in-one sensor pod with integrated transmitter, the single-step applicator, and the optional standalone receiver. Image courtesy of Dexcom UK.

Accuracy

The number that matters is the ±20/20 agreement rate, the proportion of CGM readings close enough to laboratory truth to dose insulin from without a finger-prick. For the G7, that figure is 95.3% at the upper-arm placement Dexcom recommends, and 93.2% on the abdomen (Garg 2022, Diabetes Technology and Therapeutics). Paediatric data carries the same picture: 95.3% within ±20/20 on the upper arm and 92.9% on the abdomen across ages 7 to 17 (Laffel et al. 2022, Journal of Diabetes Science and Technology). The full thesis on what these numbers mean, and on the small fraction of readings that fall outside the ±40/40 safety band where errors become large enough to matter clinically, lives on the accuracy page.

Dexcom G7 plus or minus 20/20 agreement across four populations Adult upper arm 95.3%, adult abdomen 93.2%, paediatric upper arm (ages 7 to 17) 95.3%, paediatric abdomen (ages 7 to 17) 92.9%. Anchored on Garg 2022 for adult data and Laffel 2022 for paediatric data. Adult, arm 18 years and older 95.3% ±20/20 Garg 2022 Adult, abdomen 18 years and older 93.2% ±20/20 Garg 2022 Paediatric, arm ages 7 to 17 95.3% ±20/20 Laffel 2022 Paediatric, abdomen ages 7 to 17 92.9% ±20/20 Laffel 2022 ±20/20 agreement, the proportion of readings inside the safe-dosing band, by site and age group. Anchored on Garg 2022 (adults, n=316) and Laffel 2022 (paediatrics, ages 7 to 17). Dexcom Medical Affairs review confirmed 7 May 2026.
The G7 holds the ±20/20 agreement above 92% across the four population-and-site combinations. The upper-arm placement Dexcom recommends comes through strongest in both adults and paediatrics.
A child wearing a Dexcom G7 sensor on the upper arm
The G7 is approved from age 2, with upper-arm placement for older children and a buttock option for ages 2 to 6. Image courtesy of Dexcom UK.

AID system compatibility

The G7 has the widest AID system compatibility of any CGM currently on the UK market. Whichever pump someone is on, the sensor does not have to change.

One sensor, three AID systems. The G7 is the only CGM currently approved for use with Omnipod 5, Tandem t:slim X2 with Control-IQ, and CamAPS FX, the three patient-led AID systems on the UK market. The MiniMed 780G runs on its own three-sensor ecosystem and does not pair with the G7.

Dexcom G7 AID system compatibility Four AID systems compared. G7 pairs with Omnipod 5, Tandem t:slim X2, and CamAPS FX. G7 does not pair with the MiniMed 780G, which uses MiniMed-ecosystem sensors only. Omnipod 5 Insulet, tubeless ✓ G7 paired since launch t:slim X2 Tandem, Control-IQ ✓ G7 paired G6 also supported CamAPS FX YpsoPump, tubed ✓ G7 paired integration confirmed MiniMed 780G Medtronic, tubed × No G7 pairing MiniMed sensors only
Three of four UK AID systems pair with the G7. The MiniMed 780G runs on its own sensor ecosystem (Guardian 4, Simplera Sync, and the Abbott-made Instinct).

For people using a Tandem, Insulet, or mylife system, the G7 is the same sensor across pumps, a level of flexibility no other CGM currently offers.

What the G7 brings beyond accuracy

Alarms and alerts

Customisable high and low alerts, urgent-low alert, rapidly-falling alert. The 12-hour grace period at end-of-life means no end-of-sensor alarm until the grace window expires, less interruption.

The Dexcom G7 app on a smartphone, showing a current glucose reading, trend arrow, and recent trace
The Dexcom G7 app, the primary display for glucose data, alerts, and trend information. Image courtesy of Dexcom UK.

Follow and Share

The Dexcom Follow app lets family, carers, and school staff see real-time glucose data. Particularly valued in paediatric use and in transition to independent young adulthood.

Two athletes wearing Dexcom G7 sensors on the upper arm
Real-time glucose visibility, shared with the people who matter, on or off the field. Image courtesy of Dexcom UK.

All-in-one design

Unlike the G6, the G7 has no separate transmitter clip. The transmitter sits inside the disposable sensor pod, fewer parts to manage, fewer things to lose.

A chef in their kitchen, Dexcom G7 sensor visible on the upper arm
The G7 in working life. The slim, all-in-one pod sits flat on the upper arm. Image courtesy of Dexcom UK.

Optional calibration

Factory-calibrated by default, but accepts an optional calibration entry if someone wants one. Any calibration entered should come from a properly performed finger-prick reading, never from another CGM.

Receiver option

A standalone Dexcom receiver is available for anyone who prefers not to use a smartphone, including settings (work, school, prison-related) where personal phone use is restricted.

Survive and Thrive, Dexcom G7

A one-page A4 resource for the first two weeks on the G7. Sensor placement, alarm priorities, share-and-follow setup, and the everyday habits that keep accuracy where it should be.

Download the PDF All GNL resources

Device 1 of 5

Dexcom G7

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Read more on GNL

The IOB Trade-Off: how four AID systems make different bets on insulin → Podcast Episode 37: Dexcom Medical Affairs on the G7 evidence base → The CGM Framework: the five-question test behind every device review →
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