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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.
Banner explaining FreeStyle Libre data, showing smartphones with glucose graphs and a current reading on a yellow background.

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

Smartphone screen showing a glucose value, trend arrow, and graph, with labels explaining current reading, trends, history, and notes.

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.

Smartphone showing a time-in-range glucose report with colored bars, illustrating time above, below, and within the target range.

Track your progress over time to see how much time you’ve spent in or out of range.

  • Target Glucose Range 

    The more time you spend here, the better your A1c.

  • Above Target Glucose Range

    Shows when your glucose was too high so you can pinpoint what may have caused it to spike.

  • Below Target Glucose Range

    Shows when your glucose was too low so you can pinpoint what may have caused it to dip.

You may not always be within your target range, but knowing what it is can help you better understand how food, activities, and medications can impact your glucose.

Smartphone screen showing glucose trend arrows and labels explaining rising, falling, or stable glucose levels.

Know where your glucose is headed.

The arrows indicate the direction of your glucose readings, helping you interpret them more easily, and to respond as needed.

Smartphone screen showing a glucose value, trend arrow, and graph, with labels explaining current reading, trends, history, and notes.

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.

Smartphone showing a time-in-range glucose report with colored bars, illustrating time above, below, and within the target range.

Track your progress over time to see how much time you’ve spent in or out of range.

  • Target Glucose Range 

    The more time you spend here, the better your A1c.

  • Above Target Glucose Range

    Shows when your glucose was too high so you can pinpoint what may have caused it to spike.

  • Below Target Glucose Range

    Shows when your glucose was too low so you can pinpoint what may have caused it to dip.

You may not always be within your target range, but knowing what it is can help you better understand how food, activities, and medications can impact your glucose.

Smartphone screen showing glucose trend arrows and labels explaining rising, falling, or stable glucose levels.

Know where your glucose is headed.

The arrows indicate the direction of your glucose readings, helping you interpret them more easily, and to respond as needed.

View video for full details.

You may also download these helpful guides for more information.  
Quick Start Guide PDF (1.5mb)
Sensor Adhesion Guide PDF (1.1mb)

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.

Diagram comparing sensor glucose and blood glucose at 4.2 mmol/L, illustrating stable glucose levels with minimal difference.
Stable glucose levels

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

Diagram showing rising glucose levels, where sensor glucose (6.9 mmol/L) lags behind higher blood glucose (8.3 mmol/L).
Climbing glucose levels

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

Diagram showing dropping glucose levels, where sensor glucose (7.8 mmol/L) lags behind lower blood glucose (6.3 mmol/L).
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
A contented woman wearing a FreeStyle Libre sensor standing outside with her hand on her hips.

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.
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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.

The FreeStyle Libre 3 Flash Glucose Monitoring System (FreeStyle Libre 3 Reader or FreeStyle Libre 3 app used with FreeStyle Libre 3 Plus Sensor) is indicated for measuring interstitial fluid glucose levels continuously in people aged 2 years and older with diabetes mellitus. Always read and follow the label/insert.

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