Dexcom’s 15-day G7 sensor: fewer changes, and what it means for you
Dexcom’s G7 15-Day sensor launched in late 2025, cutting sensor changes to about two a month. What is new, and what to ask your team about UK availability.
Dexcom has launched a longer-lasting version of its G7 glucose sensor in the United States, one designed to run for about 15 days instead of the usual ten. In practice that means roughly two sensor changes a month rather than about one every ten days, fewer warm-up gaps, and less frequent adhesive coming on and off your skin. Dexcom also says the sensor is more accurate than before. It is a US launch first, and UK availability follows on its own timeline, so the honest answer to can I get this is to check with your team rather than assume it is already here.
- A CGM (continuous glucose monitor) is a small sensor worn on the skin that reads your glucose day and night and sends it to a phone or receiver.
- The new G7 15 Day sensor is designed to last about 15 days, so you change it roughly twice a month instead of around weekly.
- Fewer changes means fewer warm-up windows, the short gap after a new sensor starts before it shows live readings.
- Dexcom reports better accuracy as well as longer wear, though a sensor is still a monitor, not something that gives you insulin.
- This launched in the US first: UK availability comes separately, so what you can get here is worth checking with your team.
A sensor that lasts about fifteen days
Dexcom began selling the G7 15 Day in the US on 1 December 2025. The headline change is wear time: where the standard G7 runs for around ten days, this version is designed to last roughly fifteen and a half, which works out at about two changes a month. Dexcom also states the sensor is more accurate than before. Everything else about it being a CGM stays the same: it reads glucose continuously, shows the trend with an arrow, and can alarm for highs and lows, which is what makes it useful for catching a fall before it becomes a problem.
What fewer changes actually feels like
The gains here are the quiet, practical kind. Every sensor change comes with a short warm-up, a stretch where you are without live readings, so halving how often you change means fewer of those gaps and fewer times you are applying a new one at an awkward moment. It is also less adhesive going on and off your skin, which matters if you get irritation, and fewer sensors to remember to reorder. For anyone who finds sensor-change day a small hassle, doing it half as often is a real, if undramatic, improvement.
The part to be level-headed about is availability. This is a US launch, and a device being out in the States does not mean it is on the NHS or on private prescription here, or on the same date. UK availability, and whether it works with your current setup or any closed loop you use, follows separately. So this is not something to expect at your next appointment automatically. If longer wear appeals to you, the sensible step is to ask your team what is available to you here rather than assume.