Hi there! I understand your Libre app is repeatedly showing critically low glucose readings even after changing sensors. That definitely calls for a closer look. To help you best, could you tell me:

- How long after applying a new sensor do you start seeing these low readings?
- Are you able to confirm these low readings with a finger-stick glucose test?
- Have you noticed if the sensor is applied on clean, dry skin and avoiding scar tissue or areas with pressure?
- Is the sensor securely attached to your skin without any looseness?

Meanwhile, here are some helpful steps that often improve Libre app reading accuracy when you get false low alerts:

1. Check Sensor Application: Make sure the sensor is on clean, dry, intact skin without scar tissue. Apply it where you usually get good readings. If the sensor is loose or the tip isn’t fully inserted, it may cause bad readings. Replace the sensor if it feels loose10.

2. Warm-up Period: The Libre sensor can be less accurate during the first 12-24 hours after application especially if you are inactive. Try to stay lightly active during this time to help provide more accurate readings6.

3. Verify with Finger-stick Testing: When you see a low alert, do a finger-stick blood glucose test to confirm. Sometimes, the sensor can give false low alerts but your finger-stick should be your reference5.

4. Hydration & Avoid Pressure: Staying hydrated and avoiding pressure on the sensor site is important to prevent low or inaccurate readings1.

5. Restart & Update App: Sometimes, restarting your iPhone or reinstalling the Libre app can help fix any app glitches causing incorrect readings4.

If you’ve tried these and still get low readings, it could be a sensor defect. Abbott has acknowledged a small number of sensors may give inaccurate data, and they offer replacements if needed7.

Let me know what you’ve tried so far and your answers to my questions, and we’ll figure this out together. Are you able to do some finger-stick tests for comparison?