Understanding Glucose Readings

For LibreLinkUp App Versions 4.0 or Later

When you open LibreLinkUp, you will see the latest glucose reading from your connections, an arrow indicating which direction their glucose is trending, and a glucose graph.

1

Navigation Menu

Tap to open the navigation menu.

2

Notification Settings

Tap to go to the connection’s notification settings.

3

Glucose reading card

The bold number indicates your connection’s latest glucose reading in what’s called a glucose reading card. The color band on the reading card indicates whether your connection’s glucose is high, low, in target, or out of target.

  1. Red indicates a low glucose reading(<70 mg/dL or 3.9 mmol/L).

  2. ‍Orange indicates a high glucose reading (>250 mg/dL or 13.9 mmol/L) for FreeStyle Libre 3 users, (>240 mg/dL or 13.3 mmol/L) for all other users.

  3. Green indicates readings in your connection’s target range.

  4. Yellow indicates readings between your connection’s target range and their high and low levels

In some cases, instead of a bold number, you may see a glucose reading of “LO” or “HI.”

  1. "LO" indicates a glucose reading lower than 2.2 mmol/L (40 mg/dL).”

  2. "HI" indicates a glucose reading higher than 22.2 mmol/L (400 mg/dL) for FreeStyle Libre 2 users in United States and Canada and 27.8 mmol/L (500 mg/dL) for all other users.

If either of these readings is seen, the App User Manual that corresponds to the FreeStyle Libre app states that the user should check their blood glucose with a test strip. If they get a “LO” or “HI”result from a blood glucose meter, the FreeStyle Libre app user should contact their healthcare professional immediately.

In other cases, instead of a bold number and timestamp, you may see --- and “No Recent Data”. This appears because no data from your connection has been received in the LibreLinkUp app in the last 5 minutes.

You may see --- and “No Recent Data” for the following reasons:

  1. If your connection is using a FreeStyle Libre sensor:

    • Your connection’s device has no Internet connectivity

    • Your connection has not scanned their sensor in the last 5 minutes

    • Your connection does not have an active FreeStyle Libre sensor

    • There is a service interruption that is preventing the uploading of glucose data from the FreeStyle Libre app to LibreView services

  2. If your connection is using a FreeStyle Libre 2 sensor:

    • Your connection’s device has no Internet connectivity

    • Your connection has not scanned their sensor in the last 5 minutes

    • Your connection does not have an active FreeStyle Libre 2 sensor

    • Your connection is experiencing signal loss with their FreeStyle Libre 2 sensor

    • There is a service interruption that is preventing the uploading of glucose data from the FreeStyle Libre app to LibreView services

  3. If your connection is using a FreeStyle Libre 3 sensor:

    • Your connection’s device has no Internet connectivity

    • Your connection does not have an active FreeStyle Libre 3 sensor

    • Your connection is experiencing signal loss with their FreeStyle Libre 3 sensor

    • There is a service interruption that is preventing the uploading of glucose data from the FreeStyle Libre app to LibreView services

4

Trend arrow

This arrow shows which way your connection’s glucose was heading at the time of the glucose reading. There are five possible trends:

Glucose is rising quickly

More than 0.1 mmol/L (2 mg/dL) per minute

Glucose is rising

Between 0.06 mmol/L – 0.1 mmol/L (1‐2 mg/dL) per minute

Glucose is changing slowly

Less than 0.06 mmol/L (1 mg/dL) per minute

Glucose is falling

Between0.06 mmol/L – 0.1 mmol/L (1‐2 mg/dL) per minute

Glucose is falling quickly

More than 0.1 mmol/L (2 mg/dL) per minute

5

Glucose graph

The glucose graph displays up to the last 12 hours of your connection’s available glucose history, high and low glucose alarm levels (if the connection is using a FreeStyle Libre sensor that supports glucose alarms and the glucose alarm setting is enabled in the LibreLinkUp app), and the connection’s target glucose range.

The glucose graph is interactive: tap anywhere in the glucose graph area and the glucose reading card will be updated with the glucose value and timestamp for that point on the glucose trace. The glucose graph is updated each time the app is opened to the glucose graph screen if your device has internet connectivity. Gaps may appear in the glucose trace if this glucose data is not available in the connection’s glucose history. If the connection’s glucose reading exceeds 21 mmol/L (350 mg/dL), the glucose trace will display at 21 mmol/L (350 mg/dL) but the glucose reading card will accurately display the connection’s glucose reading for that time.

The high and low glucose alarm levels display on the glucose graph if you have turned the alarms on in the LibreLinkUp app.

The target glucose range is the green shaded area in the glucose graph, and the values are set by the connection in their FreeStyle Libre app.

6

Logbook

Tap to go to the Logbook screen.

The logbook displays the last 2 weeks of glucose events.

  1. If your connection is using a FreeStyle Libre sensor:

    • The glucose events include glucose readings when the connection scanned their sensor.

  2. If your connection is using a FreeStyle Libre 2 sensor:

    • The glucose events include glucose readings when the connection scanned their sensor and glucose alarms.

  3. If your connection is using a FreeStyle Libre 3 sensor:

    • The glucose events include customized glucose alarms you received based on your connection’s glucose readings.

Tap on a glucose event in the list to view event details.

Still Have Questions?

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Related Articles

  1. The LibreLinkUp app is only compatible with certain mobile device and operating systems. Please check www.librelinkup.com for more information about device compatibility before using the app. Use of FreeStyle Libre-compatible apps and LibreLinkUp may require registration with LibreView. The LibreLinkUp mobile app is not intended to be a primary glucose monitor: users must consult their primary device(s) and consult a healthcare professional before making any medical interpretation and therapy adjustments from the information provided by the app. This device is not intended to replace self-monitoring practices as advised by a physician.
  2. The FreeStyle LibreLink app is only compatible with certain mobile devices and operating systems. Please check the website for more information about device compatibility before using the app.
  3. The FreeStyle LibreLink app and the FreeStyle Libre reader have similar but not identical features. A finger prick test using a blood glucose meter is required during times of rapidly changing glucose levels when interstitial fluid glucose levels may not accurately reflect blood glucose levels or if hypoglycaemia or impending hypoglycaemia is reported by the FreeStyle LibreLink app or when symptoms do not match the app readings. The FreeStyle Libre sensor communicates with the FreeStyle Libre reader that started it or the FreeStyle LibreLink app that started it. A sensor started by the FreeStyle Libre reader will also communicate with the FreeStyle LibreLink app.
  4. Transfer of glucose data between applications depends on internet connectivity.
  5. Both LibreLinkUp and FreeStyle Libre app users must enable glucose alarms in their apps and have internet connectivity for the LibreLinkUp user to receive shared glucose alarms from Connections using a FreeStyle Libre 2 sensor that does not provide automatic glucose readings. The FreeStyle app users must have internet connectivity and the LibreLinkUp user must have internet connectivity and enable glucose alarms in their app for the LibreLinkUp user to receive LibreLinkUp-set glucose alarms when the Connection is using a FreeStyle Libre 2 sensor that provides automatic glucose readings.
  6. Requires use of a compatible FreeStyle sensor.
  7. Not all mobile apps, products, or features are available in all regions.