Dexcom G7 is designed to address the specific and serious concern of nocturnal hypoglycemia. Its core functionality revolves around continuous glucose monitoring (CGM), transmitting real-time glucose readings to the iPhone app every five minutes. For sleep safety, the app allows users to set customizable high and low alert thresholds. When levels breach these limits, the app emits urgent, audible alerts that can wake a sleeping user. A critical feature for this scenario is the optional 'Urgent Low Soon' alert, which provides a warning approximately 20 minutes before a predicted severe low, offering a valuable window for intervention. Furthermore, the app's 'Follow' system enables caregivers or family members to also receive these alerts on their own devices, adding a layer of remote monitoring and peace of mind. While the sensor and app system requires a prescription and can represent a significant ongoing cost, reviews from new diabetics indicate its value in catching dangerous, unexpected lows that traditional fingerstick checks might miss, particularly at night. Some users note occasional connectivity delays between the sensor and phone, but the overall reliability for critical alerts is widely reported as strong.
Key Features
Customizable high/low glucose alerts
Urgent Low Soon predictive alert
Remote monitoring via Follow system
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"This last week, it caught multiple dangerously low readings both every night and every day... If I had been using a finger stick, I don’t think I would have been aware there was a very serious problem."
★★★★★Verified User Review
iOSUpdated Jan 4, 2026
