| Urgent Low Alert | 55 mg/dL (fixed, cannot disable) |
| Low Alert Range | 60–100 mg/dL |
| High Alert Range | 120–400 mg/dL |
| Rate Alerts | Rise/Fall at 2–3 mg/dL/min |
| Alert Repeat Interval | Every 30 minutes (Urgent Low) |
| Alert Profiles | Day and Night schedules supported |
| Notification Modes | Sound, vibration, or silent |
Key Takeaways
- Dexcom G7 offers multiple alert types including Urgent Low, Low, High, Rise Rate, and Fall Rate alerts
- Urgent Low at 55 mg/dL cannot be disabled — a critical safety feature
- Alert schedules let you set different thresholds for day vs. night
- Vibration-only mode and volume controls help manage alert fatigue
- Customizing alerts significantly improves time-in-range outcomes
Overview of Dexcom G7 Alert System
The Dexcom G7 continuous glucose monitor (CGM) features a sophisticated, fully customizable alert system designed to notify users of dangerous glucose excursions in real time. Unlike older CGM generations, the G7 integrates alerts directly into both the dedicated receiver and compatible smartphones, giving users flexibility in how and when they receive notifications.
Types of Dexcom G7 Alerts
Fixed Alerts
The Urgent Low Alert triggers at 55 mg/dL and cannot be turned off. It repeats every 30 minutes if glucose remains critically low. This is a non-negotiable safety baseline built into every G7 device.
Customizable Alerts
| Alert Type | Default Setting | Adjustable Range |
|---|---|---|
| Low Alert | 70 mg/dL | 60–100 mg/dL |
| High Alert | 200 mg/dL | 120–400 mg/dL |
| Fall Rate Alert | Off | 2–3 mg/dL/min |
| Rise Rate Alert | Off | 2–3 mg/dL/min |
| Signal Loss Alert | On | On/Off |
How to Customize Alerts
Using the Dexcom G7 App
- Open the Dexcom G7 app and tap the Menu icon
- Select Alerts & Sounds
- Tap any alert to adjust threshold, sound, and vibration settings
- Use Alert Schedule to create separate Day and Night profiles
Alert Schedule Feature
One of the most powerful customization tools is the Alert Schedule. Most people with diabetes benefit from tighter nighttime Low alerts (e.g., 80 mg/dL) while using more relaxed High thresholds during active daytime hours. This reduces overnight hypoglycemia risk without causing alert fatigue during the day.
Reducing Alert Fatigue
Alert fatigue — becoming desensitized to frequent notifications — is a real clinical concern. Studies show excessive alerts lead users to silence or ignore them. Strategies to reduce fatigue include:
- Set High alerts at a realistic target, not perfection (180–200 mg/dL is reasonable for many)
- Enable Rise/Fall Rate alerts only if you use insulin with a rapid onset
- Use vibration-only mode during meetings or sleep
- Review your alert history weekly and adjust thresholds based on patterns
Pairing G7 Alerts with the Right Supplies
Accurate alerts depend on accurate sensor readings. Proper sensor placement and adhesion directly affect G7 reliability. MDS Diabetes stocks Dexcom G7 sensors, adhesive patches, and CGM accessories to help you maintain consistent sensor wear and maximize the accuracy your alert settings depend on.
Clinical Recommendations
The American Diabetes Association recommends a Time-in-Range (TIR) goal of 70–180 mg/dL for most adults with Type 1 or Type 2 diabetes. Setting your Low alert at 70 mg/dL and High alert at 180 mg/dL directly reinforces this clinical target. For pregnant individuals, tighter ranges (63–140 mg/dL) are advised — adjust alerts accordingly in consultation with your endocrinologist.