Six months. Over 180 sensors. Thousands of glucose readings. I think I’ve finally earned the right to have an opinion on the Dexcom G7.
The short version: it’s better than the G6 in almost every way, and there are still a few things that drive me absolutely crazy.
What Actually Changed from G6
The G7 is noticeably smaller — about 60% the size of the G6, which matters more than I expected. The transmitter and sensor are now one integrated unit, which means no more forgetting to transfer your transmitter. You just stick it on and that’s it.
Warmup time dropped from two hours to thirty minutes. This sounds minor until you’re sitting in a restaurant watching your CGM warm up while your food gets cold.
The Good Stuff
Accuracy. My numbers have been remarkably accurate. I’ve done dozens of fingerstick comparisons and the G7 is almost always within 10-15 mg/dL, often within 5. That’s meaningful.
Wear comfort. The smaller profile means I barely notice it on my arm. I’ve slept on it, swum in it, and worked out in it without problems.
The app is finally decent. Dexcom’s app has been historically clunky. The G7 app is clean, readable, and doesn’t make me want to throw my phone.
What Still Frustrates Me
The 12-hour grace period sensor. When your session ends, Dexcom gives you a 12-hour extension, but you can’t restart it from the beginning. If your sensor is reading consistently and you want to stretch it a few extra days, that’s not officially possible — and it should be.
The adhesive. On hot days, or if you’re an active sweater, the adhesive can start peeling by day 8. I’ve started using Skin Tac as a primer and it makes a significant difference.
The alarms can’t be silenced for long enough. The maximum snooze time is 30 minutes for some alerts, which isn’t nearly enough for sleeping through a mild overnight high.
Bottom Line
If you’re on the G6, upgrading to G7 is worth it. If you’re new to CGM, the G7 is the best consumer-accessible option on the market right now. Nothing is perfect, but this is genuinely good technology.
Note: I’m not affiliated with Dexcom. I paid for this CGM with my own insurance.