FreeStyle Libre 2 PLUS Sensor

About FreeStyle Libre 2 Plus 

The FreeStyle Libre 2 Plus is a wearable continuous glucose monitor (CGM) sensor designed for people with medically diagnosed diabetes. It allows you to track your glucose levels throughout the day without routine finger-prick diabetes testing, sending readings to a compatible device so you can monitor trends and patterns. 

Regular glucose monitoring is essential for preventing complications like nerve damage, kidney disease, and cardiovascular problems associated with diabetes. 

Key features of Libre 2 Plus: 

• A small wearable sensor applied to the back of the upper arm. 
• Continuous glucose monitoring 24 hours a day.
• Readings available via compatible Libre reader or smartphone app. 
• Optional alarms for high and low glucose levels. 
• Easy scanning to view glucose data and trends.
• 15-day sensor wear time.

What is Libre 2 Plus glucose monitoring used for?

Libre 2 Plus sensors are used to monitor glucose levels in people with diabetes, helping you track changes and trends over time. Your Libre 2 Plus can help:

• track glucose levels continuously 
• identify glucose patterns and trends 
• supporting management of type 1 and type 2 diabetes 
• help guide treatment decisions alongside healthcare professionals 

Continuous monitoring provides more detailed insights than traditional testing methods, helping you better understand how food, exercise, and medication affect your glucose levels.

This monitoring can help you improve your overall glucose control, allowing you to reduce unexpected highs and lows. It also means you can make more informed and sustainable decisions about your treatment options when planning your care with a clinician.  

For more help, read our guide to creating a suitable diabetes diet.

Is Libre 2 Plus being discontinued?

No, Libre 2 Plus is not being discontinued. It forms part of the evolving FreeStyle Libre system developed to improve diabetes management. 

However, the standard Libre 2 sensor is being discontinued and replaced by Libre 2 Plus, Libre 3 and Libre 3 Plus.

How does Libre 2 Plus continuous glucose monitoring work?

Libre 2 Plus uses a small sensor inserted just under the skin to measure glucose levels in the fluid surrounding your body cells (the interstitial fluid). This allows continuous tracking of glucose levels throughout the day and night. 

The system works through several key steps: 

• A tiny filament sits just under your skin after the sensor is applied. 
• The sensor measures glucose levels in your interstitial fluid.
• Readings are recorded automatically every few minutes. 
• You scan the sensor with the Libre app or reader to view your data. 
• Trend arrows and historical glucose data are displayed. 

Who can use Libre 2 Plus sensors?

Libre 2 Plus sensors are designed for people medically diagnosed with diabetes who need to monitor their glucose levels regularly. 

The system may be suitable for people: 

• with type 1 diabetes 
• with type 2 diabetes 
• who require regular glucose monitoring 

The Libre 2 Plus:

• is approved for people aged 2 years and older 
• should be used under guidance from a healthcare professional 
• may be recommended by a diabetes specialist or GP 

Learn more with our expert guide to diabetes mellitus.

How to use Libre 2 Plus

Libre 2 Plus sensors are applied to the back of the upper arm and worn continuously for up to 15 days. 

To use your Libre 2 Plus:

1. 1. Wash and dry your hands thoroughly. 
2. 2. Clean the application site on the back of the upper arm using the supplied wipe. 
3. 3. Peel the lid from the sensor pack and unscrew the cap from the sensor applicator.
4. 4. Line up the dark mark on the sensor applicator with the dark mark on the sensor pack, press firmly and lift. Do not put the cap back on the sensor applicator.
5. 5. Apply the sensor to the back of your arm by pressing firmly and listen for the click.
6. 6. Wait for a few seconds, and then pull back slowly, leaving the sensor on your skin.
7. 7. Start the sensor using the compatible Libre app or reader. 
8. 8. Wait for the sensor activation period. 
9. 9. Scan the sensor whenever you want to check glucose readings and trends. 

How long does Libre 2 Plus take to start giving readings?

After applying a Libre 2 Plus sensor, there is a short activation or warm-up period before glucose readings become available. 

Once activated, the sensor begins recording glucose levels continuously and allows you to scan the sensor to view your readings and trends. 

How long does the Libre 2 Plus battery last?

Libre 2 Plus sensors contain a built-in battery designed to last for the entire life of the sensor. 

Each sensor works for up to 15 days, after which it will stop functioning and must be replaced with a new sensor. 

Where to buy FreeStyle Libre 2 Plus in the UK

FreeStyle Libre 2 Plus sensors are prescription-only medical devices in the UK. This means they can only be supplied following an appropriate medical assessment. 

You can request the FreeStyle Libre 2 Plus online from Chemist4U by completing a short questionnaire, which will be reviewed by one of our pharmacists before your order is approved.

Order your Libre 2 Plus sensor with Chemist4U

Standard Libre 2 Plus prices

With Chemist4U, Libre 2 Plus prices start from £50.99 for a single sensor, though multipack savings are available.

Libre 2 Plus on the NHS

Some people with diabetes may receive Libre sensors through the NHS if they meet specific clinical criteria set out in NICE guidelines. 

Eligibility often depends on factors like: 

• your type of diabetes 
• insulin treatment requirements 
• your difficulty managing glucose levels 

Difference between FreeStyle Libre 2 Plus and Libre 2

Both the Libre 2 and Libre 2 Plus sensors offer continuous glucose monitoring, but Libre 2 Plus provides a slightly longer wear time and compatibility with newer system updates. 

There are then more modern sensors, like the FreeStyle Libre 3 Plus, that offer automatic real-time updates with no need to scan your device.

Potential side effects 

Libre 2 Plus sensors are generally well tolerated, but some users may experience mild skin reactions where the sensor is applied. 

Possible side effects include: 

• skin irritation 
• redness 
• itching 
• sensitivity to the adhesive 

Seek medical advice if you experience: 

• severe skin irritation 
• signs of allergic reaction 
• persistent swelling or pain at the sensor site 

If irritation does not improve, remove the sensor and speak with a healthcare professional. 

Storage information

Libre 2 Plus sensors should be stored according to the manufacturer’s instructions. 

General storage guidance includes: 

• store in a cool, dry place 
• keep within the recommended temperature range 
• do not use if the packaging is damaged or opened 
• follow the instructions included with the product 

Proper storage helps maintain sensor performance and accuracy. 

Frequently asked questions about FreeStyle Libre 2 Plus

Is Libre 2 Plus water-resistant? 

Yes. Libre 2 Plus sensors are water-resistant and can usually be worn during everyday activities like showering, bathing, or exercising. However, they should not be submerged beyond the manufacturer’s recommended limits. 

How to remove Libre 2 Plus?

To remove the sensor, gently peel back the adhesive edge and slowly lift it away from the skin. Clean the area with warm water and mild soap. 

Which arm is more accurate for blood sugar readings? 

The sensor is designed to be worn on the back of the upper arm. Either arm may be used as long as the sensor is placed in the recommended area. 

How to connect it to the app?

Download the Libre app on your compatible smartphone, enable Bluetooth or NFC as required, and follow the on-screen instructions to scan and activate the sensor. 

How accurate is the FreeStyle Libre 2 Plus sensor? 

Clinical studies show that CGM systems like the FreeStyle Libre provide reliable glucose data that closely reflects blood glucose trends. However, occasional finger-prick tests may still be needed in certain situations. Libre provide reliable glucose data that closely reflects blood glucose trends. However, occasional finger-prick tests may still be needed in certain situations. 

Do you still need finger-prick tests with Libre 2 Plus? 

Most routine finger-prick tests are no longer necessary. However, healthcare professionals may recommend them in situations where symptoms do not match sensor readings. 

Can Libre 2 Plus detect low blood sugar automatically? 

Yes. Libre 2 Plus sensors can provide optional alarms to alert users if glucose levels fall below or rise above preset thresholds. 

What happens if my Libre 2 Plus sensor falls off early? 

If a sensor becomes loose or falls off before the 15-day wear period ends, contact the manufacturer or pharmacy supplier for advice or replacement options. 

Can Libre 2 Plus be used during exercise? 

Yes. Many people wear Libre sensors during exercise to monitor how physical activity affects glucose levels. 

Can you sleep on the Libre 2 Plus sensor? 

Yes. The sensor is designed to be worn continuously, including during sleep. 

Does Libre 2 Plus work with iPhone and Android? 

Libre sensors are compatible with many iPhone and Android devices through the Libre app. Always check device compatibility before use. 

Can you travel on a plane with Libre 2 Plus? 

Yes. Libre sensors are generally safe to wear while travelling by air. 

Can Libre 2 Plus go through airport scanners? 

Airport scanners are generally safe, but users should inform security staff that they are wearing a medical device and follow manufacturer guidance if additional screening is required. 

Sources 

• Diabetes. (2023). NHS. [Accessed on 19 March 2026].
• Blood glucose monitoring. (2023). NHS. [Accessed on 19 March 2026].
• Type 1 diabetes in adults: diagnosis and management (NG17). (2022). NICE. [Accessed on 19 March 2026].
• Type 2 diabetes in adults: management (NG28). (2022). NICE. [Accessed on 19 March 2026]. 
• Accuracy of a 15-day Factory-Calibrated Continuous Glucose Monitoring System With Improved Sensor Design. (2025). PubMed. [Accessed 19 March 2026].