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What is

Continuous Glucose Monitoring?

Continuous Glucose Monitoring (CGM) devices, such as the FreeStyle Libre portfolio of products, are small, simple and easy to use1 sensor-based glucose monitoring systems. They provide real-time glucose readings day and night, without fingerpricks.


Women with coffee smiling while the FreeStyle Libre sensor is visibile on the back of her arm.
Women with coffee smiling while the FreeStyle Libre sensor is visibile on the back of her arm.
Women with coffee smiling while the FreeStyle Libre sensor is visibile on the back of her arm.

Benefits of CGM vs. Blood Glucose Monitoring

Real Time Drop icon

Blood Glucose

Measures glucose levels in blood

  • Requires finger pricks

  • Requires manual testing multiple times a day

  • Requires you to carry strips, lancet and meter to test

  • Provides glucose levels at a single moment of time

FreeStyle Libre 2 sensor icon FreeStyle Libre 3 sensor icon

FreeStyle Libre Portfolio

Measures glucose levels in interstitial fluid

  • Painless,2 without finger pricks

  • Automatically measures glucose levels every minute

  • Sensor delivers readings directly to your smartphone◊,◊◊,ǁ

  • Provides the whole picture about both the current glucose level and changes over timeφ

  • Continuous glucose levels help to see the impact of activites and food

  • Proven to reduce time in hypoglycaemia2,3 and improve overall glucose control4

How do FreeStyle Libre sensors work?

FreeStyle Libre sensors are a technology that allows people with diabetes to see their glucose levels in real-time on their smartphone◊,◊◊

1. Wear the sensor

The sensors are small, unobtrusive, and easily applied to the back of the upper arm1. The sensors come with an applicator and use a small, flexible tip that is inserted just under the skin.

2. Sensor measures glucose levels

The sensor continuously measures interstitial fluid glucose levels through the whole 14 day wear period.

3. View glucose readings on your smartphone

Start your sensor using your smartphone app◊,◊◊ to check your glucose readings in real-time and receive optional alarms if they are too high or too low.¤

What's the difference between interstitial fluid and blood glucose readings?

Sensor glucose readings come from the interstitial fluid, a thin layer of fluid that surrounds the cells of the tissue below the skin and not from the blood.5

Watch the video to find out the difference between interstitial fluid monitoring and blood glucose monitoring.

Type 1 Times 2

By Mary Murphy, an engineer, a person with Type 1 and a parent of a child with Type 1.


“I don’t see diabetes as a block to anything."

Why the FreeStyle Libre is the #1 one sensor worldwide6 – and why our customers love and recommend them.


Discover the FreeStyle Libre 2 and FreeStyle Libre 3 systems

#1 Sensor based glucose monitoring system used worldwide6

FreeStyle LibreLink & FreeStyle Libre 3 app

References & Disclaimers

Images are for illustrative purposes only. Not real patient or data. 

1. Data on file, Abbott Diabetes Care, Inc.

2. Haak, T. Diabetes Ther (2017):

3. Leelarathna, L. N Engl J Med. (2022): DOI: 10.1056/NEJMoa2205650.

4. Evans, M. Diabetes Ther (2020):

5. [accessed July 2023].

6. Data on file, Abbott Diabetes Care, Inc. Data based on the number of users worldwide for the FreeStyle Libre portfolio compared to the number of users for other leading personal use sensor based glucose monitoring systems.

† Finger pricks are required if glucose readings and alarms do not match symptoms or expectations.

ǁ Glucose readings are automatically displayed in the FreeStyle LibreLink app only when your smartphone and your FreeStyle Libre 2 sensor are connected and in range 

◊ The FreeStyle LibreLink app works with FreeStyle Libre 2 sensor and is only compatible with certain mobile devices and operating systems. Please check the website for more information about device compatibility before using the app. Use of FreeStyle LibreLink may require registration with LibreView.

◊◊ The FreeStyle Libre 3 app works with FreeStyle Libre 3 sensor and is only compatible with certain mobile devices and operating systems. Please check our website for more information about device compatibility before using the app. Sharing of glucose data requires registration with LibreView.

φ For a complete glycaemic picture on the FreeStyle Libre 2 system, scan once every 8 hours during signal loss.

¤ Alarms notifications will only be received when alarms are turned on and the FreeStyle Libre 2 sensor is within 20ft of the reading device. Users must have override do not disturb settings enabled to receive alarms and alerts on their smartphone. For FreeStyle Libre 3 sensor users, the notifications will only be recieved when alarms are turned on and the sensor is withing 33ft unobstructed of the reading device.