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Understanding your FreeStyle Libre systems data

Once you’ve connected your sensor to your smartphone13, you’ll gain insights17 into what affects your glucose levels. Here’s some handy information that explains what you’ll see.
Two phones, each displaying a different screen from the FreeStyle Libre app.

Use the data on your FreeStyle Libre systems app13 to see how you’re progressing over time. 

A phone displaying the FreeStyle Libre app and its real time glucose monitoring information.

Monitor trends and patterns from your device to see how well you’ve been managing your glucose over time30.

  • Current glucose reading

    Measured every minute, and the color lets you know if you’re in range.

  • Trend arrow

    Indicates the direction your glucose is heading and how quickly it’s rising or falling. 

  • Glucose history

    Continuous glucose graph shows how your levels have changed over the last 8 hours.

  • Add note

    Track food, exercise, medication and other events.

View video for full details.

You may also download these helpful guides for more information.  
Quick Start Guide (PDF)
Sensor Adhesion Guide (PDF)
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      Why don’t blood glucose and sensor glucose readings match?

      Glucose enters the blood first, which is what finger pricks measure32. Then, it enters the interstitial fluid (ISF) found around cells beneath the skin – this is what sensors measure32. Both are accurate but at slightly different points in time.

      Think of blood glucose as the engine of a train, and the interstitial fluid or sensor glucose as the caboose32.

      An illustration of a train. The front of the train which is blue and labeled as Blood Glucose. The caboose of the train is yellow and labeled as Sensor Glucose on stable ground.
      Stable glucose levels

      When glucose levels are stable, there’s little difference in measurements.

      An illustration of a train. The front of the train which is blue and labeled as Blood Glucose. The caboose of the train is yellow and labeled as Sensor Glucose as it heads uphill, illustrating the trailing relationship that Sensor Glucose has with Blood Glucose.
      Climbing glucose levels

      As glucose levels rise, like they can after a meal, sensor glucose lags behind blood glucose32.

      An illustration of a train. The front of the train which is blue and labeled as Blood Glucose. The caboose of the train is yellow and labeled as Sensor Glucose which is heading downhill, illustrating the trailing relationship that Sensor Glucose has with Blood Glucose.
      Dropping glucose levels

      After medication or exercise, glucose levels may fall with sensor glucose again lagging behind32.

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      You might also like:

      A man applying his FreeStyle Libre sensor on his left arm.

      Getting started with FreeStyle Libre systems.

      See how easy it is to apply4,20 and use4 your FreeStyle Libre system for the first time and gain valuable insights into your glucose trends. 
      Learn the Basics
      A man sitting on steps wearing a FreeStyle Libre sensor looking at his phone.

      Put our digital tools to work for you.

      Use our apps13 to learn how food, medicine and exercise impact your glucose. Share26 these insights17 with your loved ones and healthcare team if you wish.
      Learn More About Our Apps
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      Here for you.
      At every step.

      We want you to live life freely – without any barriers. So, if you have questions, or need further support, all you need to do is ask.
      Get Support Now

      The FreeStyle Libre 2 flash glucose monitoring system is indicated for measuring interstitial fluid glucose levels in people aged 4 years and older with diabetes mellitus. Always read and follow the label/insert.

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      ©2025 Abbott. All Rights Reserved. The circular shape of the sensor housing, FreeStyle, Libre, and related brand marks are marks of Abbott.

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