Hi! I understand your FreeStyle Libre 3 app is showing a very low blood sugar reading of 53, while your actual blood sugar is around 130. That’s quite a big difference. Let’s work through this together.

Just to clarify before we dive in:
- Did you recently start with a new sensor or has this sensor been working fine before?
- Are you noticing any alerts or sensor errors on the app?
- Have you tried rescanning the sensor with your iPhone?

Usually, discrepancies like this can happen due to:
1. Sensor placement or calibration issues
2. Sensor malfunction (sometimes a small number of sensors can be faulty)
3. Differences between blood glucose (finger stick) and interstitial glucose (sensor) readings—though 53 vs. 130 is a larger gap than typical.

Here’s a step-by-step approach to troubleshoot this:

1. Rescan the Sensor: Try scanning again ensuring the iPhone is close to the sensor and there’s no interference.
2. Check Sensor Placement: Ensure the sensor is adhered properly on your skin and not dislodged or partially lifted.
3. Restart the App and Phone: Close the FreeStyle Libre app completely and restart your iPhone (iOS 18.5). Then open the app and scan again.
4. Compare Timing of Readings: Sensor readings measure glucose in the fluid between cells, while finger sticks measure blood directly—which can cause slight lag or differences, especially if your glucose is changing rapidly. But this should not cause such a large lower reading.
5. Check for Interfering Substances: Some things like Vitamin C supplements or certain medications might cause false low readings from sensors. Are you taking anything new?
6. Review Sensor Age: How long have you been using this sensor? Sensors on their last days may give inaccurate readings.
7. Try a New Sensor: If none of the above helps, consider starting a new sensor if you have one, as occasional faulty sensors can happen1 10.

If the app continues to show dangerously low readings inconsistent with your actual glucose, do not rely solely on the app for real-time decisions—always confirm with a finger-stick test and treat based on that.

Let me know what steps you’ve tried or what you observe, and we can pinpoint it together. Are you satisfied with this approach so far?

App reading low. Blood sugar is 130. App says it’s 53

Thanks for sharing your concern about the FreeStyle Libre 3 app showing a low reading (53) when your glucometer says your blood sugar is 130. That difference is quite significant, and it’s important to get it sorted out.

From the information available about FreeStyle Libre 3, here’s some helpful context and troubleshooting steps:

1. Difference Between Sensor and Blood Glucose:
The FreeStyle Libre 3 measures glucose levels in the interstitial fluid (fluid between your cells), whereas your glucometer measures blood glucose directly from a finger prick. These readings won’t always match exactly and the sensor’s readings typically lag behind blood glucose levels by several minutes. But a difference this large is unusual3 4.

2. Sensor Accuracy and Possible Faulty Sensors:
Abbott has issued warnings that a small number of FreeStyle Libre 3 sensors may give inaccurate readings. Typically, these reports mention false high readings, but a sensor malfunction could potentially result in inaccurate low readings as well. If you suspect the sensor is faulty, Abbott recommends discontinuing use and contacting them for a replacement2 5.

3. Confirm with Fingerstick Glucose Check:
You should trust your fingerstick glucometer when there’s a discrepancy. If the FreeStyle Libre 3 app reading doesn’t match your glucometer or how you feel, perform a fingerstick test to confirm glucose1 9.

4. Troubleshooting Steps:
- Ensure your iPhone iOS 18.5 and FreeStyle Libre 3 app are both updated to the latest versions.
- Rescan the sensor carefully, making sure the phone is close to the sensor.
- Restart your iPhone and the app.
- Check the sensor placement to ensure it’s properly attached and within its recommended usage period.
- Avoid any substances or medications that can affect sensor readings if applicable.
- If the problem persists and the app continues to show inaccurate low readings, try starting a new sensor if possible.

5. Contact Abbott Support If Needed:
If after these steps the discrepancy remains, it’s a good idea to reach out to Abbott Diabetes Care directly via [email protected] to report the issue and request sensor replacement or further assistance.

Would you like me to guide you through any of these steps, or have you already tried some of them? I’m here to help you get this resolved safely. Are you satisfied with this guidance so far?