Understanding data

Discover how to easily read the data your device and sensor provide.
Two phones, each displaying a different screen from the FreeStyle Libre app.

 

Getting to know your home screen.

Your home screen shows you current glucose readings, trend arrows, glucose history, and notes you can come back to. 
Glucose reading display showing 110 mg/dL in range with a right arrow.

Monitor glucose trends and patterns to show how your levels change over time.

  • Current glucose reading

    Measured every minute, the color you see lets you 
know if you’re in range73.

  • 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 or 12 hours.

  • Add note

    Track food, insulin use, movement, and other events.

Customizing your alarms18.

Real-time alarms18 let you know the minute your glucose is too low or too high.

Step 1:
On the app31, go to the Main Menu and tap Alarms.

Step 2:
On the app31, select the optional alarm you want to change and turn on: Low, High, Signal Loss.

Step 3:
On the app31, select Override Do Not Disturb if you want an alarm to display even when your smartphone is muted or Do Not Disturb is enabled.

Understanding your glucose alarms18.

When your glucose goes above or below the threshold you set, alarms18 give you a gentle nudge. You may get an alarm18 on your smartphone at night if your levels drop below your threshold while you’re asleep. 

Alarms18 are optional and can be adjusted to be silenced when you need quiet. It’s support that’s designed to move with you, not overwhelm you.

Low glucose alarms.

A woman wearing a sensor showing her glucose data on her phone with her husband.

 

 

Low glucose alarms18 sound when your levels fall below 70 mg/dL. 

High glucose alarms.

A woman wearing a sensor showing her glucose data on her phone with her husband.

 

 

High glucose alarms18 appear when your levels rise above 250 mg/dL. 

Accessing all of your reports.

FreeStyle Libre app31 also provides reports of data over time that can be used to get the bigger picture of your glucose history. To navigate to these reports, go to the Reports tab. There, you’ll find Time in Range, Average Glucose, Low Glucose Events, Daily Patterns.
A hand holding a smartphone displaying a 112 mg/dL glucose reading with trend arrows and graph on the FreeStyle LibreLink app.

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.

FreeStyle Libre reader and its ability to show how much time is spent in each glucose range.

 

Average Glucose

 

See the overall average of your sensor readings—plus how those averages shift throughout the day. 

Your main average appears at the top. Below, see how your levels tend to look in the morning, afternoon, evening, and overnight. 

The colors help you read your averages at a glance: 

  • Green means you’re in range. 
  • Yellow, orange, or red show times when your glucose moved above or below your target.
FreeStyle Libre reader and a visual showing the direction of change for a glucose reading.

 

 

 

Low Glucose Events

The Low Glucose Events chart displays times when your glucose dropped below your set levels over a period of time.

FreeStyle Libre reader and a visual showing the direction of change for a glucose reading.

 


Daily Patterns

Your Daily Patterns graph helps you see the rhythm of your glucose throughout a typical day. Here’s how to read it:

  • The thick line shows the midpoint of your readings — your day’s “center line.”
  • The inner shaded band shows where most of your readings land.
  • The outer shaded band shows the full spread of your readings.

       Watch our short guides for more help.

Understanding your home screen
Reading your app’s home screen.
Customizing your Low and High Glucose alarms
Setting your app's thresholds.
Viewing your reports
Exploring your app's glucose data.
Share your glucose data with your doctor
Get actionable insights from data.
Share your glucose data with your loved ones
Get more peace of mind.

FAQs

Have questions? We’ve got answers to help.

A Signal Loss alarm18 notifies you when the sensor has not communicated with the FreeStyle LibreLink app31 for 20 minutes.

 

Signal loss could be caused by the sensor being too far away from your smartphone. For FreeStyle Libre 2 Plus sensors: over 6 meters (20 ft). Additionally, the Signal Loss Alarm18 can occur if Bluetooth is turned off, or another issue such as an error or problem with your sensor.

The FreeStyle LibreLink app31 updates with your glucose information every minute from the FreeStyle Libre 2 Plus sensor. On the app’s home screen, you can view your up-to-the-minute glucose reading, trend arrow, and continuous 8-hour graph.

The following information can be found on the Daily Graph:

  • Date banner with back and forward arrows to change the graph date or to open the date picker
  • Information icon to learn more about the Daily Graph
  • 24-hour view of glucose data
  • Note icon(s) displayed for logged notes
  • The Logbook

Looking for more guidance?

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