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Freestyle Libre 2 Plus Sensor

Freestyle Libre 2 Plus Sensor

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  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Monitors glucose continuously for up to 15 days per sensor
  • ✔️ Provides real-time glucose trend arrows without fingerprick testing
  • ✔️ Alerts you instantly to high or low glucose levels
  • ✔️ Water-resistant for showering and swimming up to 30 minutes
  • ✔️ Suitable for adults and children aged 4 years and over

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What Is the Freestyle Libre 2 Plus Sensor?

 

The Freestyle Libre 2 Plus sensor is Abbott's latest wearable glucose monitoring device, designed to help people with diabetes track their glucose levels continuously — without the need for routine fingerprick tests. Applied to the back of the upper arm, it measures glucose in the interstitial fluid just beneath the skin, giving you a real-time picture of where your levels are and where they're heading. If you're managing type 1 or type 2 diabetes, that kind of insight can genuinely change how you approach your day. You can explore our full range of diabetes monitoring products at Cured Pharmacy.

Each sensor lasts up to 15 days — a day longer than the previous Libre 2 — and is compatible with the FreeStyle LibreLink app on a compatible smartphone or the FreeStyle Libre 2 Plus reader. The NHS recognises flash glucose monitoring as a clinically effective approach for many people with diabetes, and Abbott's Libre range is one of the most widely used systems in the UK.

 

How Does the Freestyle Libre 2 Plus Sensor Work?

 

The sensor uses a small, flexible filament — thinner than a human hair — that sits just under the skin and measures glucose in interstitial fluid every minute. Unlike traditional blood glucose meters, you don't need to prick your finger each time you want a reading. Here's how the process works:

  • Apply the sensor to the back of your upper arm using the single-use applicator — it's quick and largely painless.
  • The sensor begins measuring interstitial glucose automatically after a short warm-up period.
  • Scan the sensor with a compatible reader or smartphone running the FreeStyle LibreLink app to receive your current glucose reading, a trend arrow showing the direction of change, and up to 8 hours of historical data.
  • Optional real-time alarms can alert you if glucose levels go too high or too low, even without scanning.

The trend arrow is particularly useful — it tells you not just where your glucose is right now, but whether it's rising, falling, or stable. That context helps you make smarter decisions about food, activity, and insulin.

 

Who Should Use the Freestyle Libre 2 Plus Sensor?

 

This sensor is suitable for a wide range of people living with diabetes. It's approved for use in adults and children aged 4 years and over. That said, it's always worth discussing with your GP or diabetes team whether it's the right choice for your specific situation.

  • Adults with type 1 or type 2 diabetes who want to reduce reliance on fingerprick testing
  • Children aged 4 and over (must be used under adult supervision)
  • People who find frequent fingerprick testing uncomfortable or impractical
  • Those who want trend data to better understand how food, exercise, and medication affect their glucose

It is not recommended as the sole monitoring method during periods of rapidly changing glucose levels, such as during intense exercise or illness, without confirming readings with a fingerprick test if symptoms don't match.

 

How Does the Freestyle Libre 2 Plus Compare to the Libre 2?

 

Feature Freestyle Libre 2 Plus Freestyle Libre 2
Wear duration Up to 15 days Up to 14 days
Real-time glucose readings Yes (continuous, no scan needed with app) Scan required for each reading
Glucose alarms Yes — high and low alerts Yes — high and low alerts
Water resistance 1 metre / 30 minutes 1 metre / 30 minutes
Age suitability 4 years and over 4 years and over

 

How Should You Store and Handle the Freestyle Libre 2 Plus Sensor?

 

Proper storage matters more than people often realise. The Freestyle Libre 2 Plus sensor should be stored at room temperature — below 30°C — and kept away from direct sunlight and moisture. Do not refrigerate or freeze the sensor, as extreme temperatures can affect its accuracy. Check the expiry date printed on the packaging before applying each sensor; an expired sensor may not perform reliably.

Once applied, the sensor is water-resistant up to 1 metre for 30 minutes, so you can shower and swim without removing it. If you're also managing other aspects of your health, you might find our vitamins and supplements range useful alongside your diabetes management plan.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Freestyle Libre 2 Plus Sensor specifications
Treatment category Diabetes monitoring / Continuous glucose monitoring (CGM)
Mechanism of action Electrochemical biosensor measuring interstitial fluid glucose every minute
Effective Up to 15 days per sensor
Suitable for Adults and children aged 4 years and over with diabetes
Active ingredient Electrochemical glucose biosensor (no pharmacological active ingredient)
Pack sizes 1 sensor per pack
UK classification Medical device (CE/UKCA marked)
Drug class N/A — medical device
Preparation Wearable subcutaneous biosensor with single-use applicator
Route of administration Subcutaneous (applied to upper arm skin surface)

Specifications of Freestyle Libre 2 Plus Sensor

 

What Is the Freestyle Libre 2 Plus Sensor and What Is It Used For?

 

The Freestyle Libre 2 Plus sensor is a wearable medical device used to continuously monitor glucose levels in people with diabetes. It is classified as a flash glucose monitoring (FGM) system and, when used with the FreeStyle LibreLink app, functions as a continuous glucose monitor (CGM). It is used to help people with type 1 or type 2 diabetes understand their glucose patterns, reduce hypoglycaemia risk, and make more informed decisions about diet, physical activity, and medication. The NHS supports the use of flash glucose monitoring for eligible patients as part of structured diabetes management.

 

What Do You Need to Know Before Using the Freestyle Libre 2 Plus Sensor?

 

Before applying the sensor, there are some important contraindications and warnings to be aware of:

  • Do not use if you have a known allergy to any of the sensor materials, including medical-grade adhesive.
  • Not recommended as the sole monitoring method during rapidly changing glucose levels — always use a fingerprick blood glucose test if your symptoms do not match the sensor reading.
  • Not validated for use in pregnant women or critically ill patients — seek medical advice before use in these situations.
  • Children under 18 must use the sensor under adult supervision.
  • Do not apply to areas of skin that are irritated, damaged, or have active skin conditions.
  • MRI scans, CT scans, X-rays, and diathermy procedures may affect sensor performance — remove the sensor before these procedures.

The following substances or situations may affect sensor accuracy:

  • High-dose paracetamol (acetaminophen) — doses above 1g may falsely elevate glucose readings.
  • Ascorbic acid (vitamin C) supplements in high doses may interfere with readings.
  • Hydroxyurea (used in some blood disorders) may affect sensor accuracy.

 

How Should You Use the Freestyle Libre 2 Plus Sensor?

 

Applying the sensor correctly is straightforward, but it's worth following each step carefully to ensure accurate readings and good adhesion throughout the 15-day wear period.

  1. Wash and dry the back of your upper arm thoroughly before application.
  2. Open the sensor pack and remove the applicator — do not touch the needle end.
  3. Press the applicator firmly against the cleaned skin until you hear a click.
  4. Remove the applicator — the sensor will remain attached to your skin.
  5. Open the FreeStyle LibreLink app or turn on your Libre 2 Plus reader and scan the sensor to activate it.
  6. Wait for the sensor warm-up period to complete before relying on readings.
  7. Scan or check the app regularly throughout the day to monitor your glucose trends.
Indication Age Group Sensor Wear Duration Scanning Frequency
Type 1 diabetes Adults and children 4+ Up to 15 days At least every 8 hours (to capture full history)
Type 2 diabetes Adults 18+ Up to 15 days At least every 8 hours
Children (supervised) 4–17 years Up to 15 days Under adult supervision

 

What Are the Possible Side Effects of the Freestyle Libre 2 Plus Sensor?

 

Like any wearable medical device, the sensor can cause localised reactions at the application site. Most are mild and resolve once the sensor is removed. If you're managing skin health alongside your diabetes, our skin care range includes products that may help soothe minor irritation.

Common side effects:

  • Redness at the sensor application site
  • Itching or mild skin irritation beneath the adhesive
  • Minor bruising or discomfort at insertion point
  • Skin indentation after sensor removal (temporary)

Less common side effects:

  • Allergic contact dermatitis (skin rash or blistering at the site)
  • Sensor detachment before the 15-day period ends
  • Inaccurate readings during periods of rapid glucose change
  • Rare: systemic allergic reaction — seek immediate medical attention if you experience swelling, difficulty breathing, or widespread rash

 

How Should You Store the Freestyle Libre 2 Plus Sensor?

 

  • Store at room temperature, between 4°C and 30°C.
  • Do not refrigerate or freeze — cold temperatures can damage the biosensor filament.
  • Keep away from direct sunlight and sources of heat.
  • Store in the original packaging until ready to use.
  • Check the expiry date before each application — do not use an expired sensor.
  • Keep out of reach of children.
  • Once applied, the sensor is water-resistant to 1 metre depth for up to 30 minutes.

If you're looking for additional support tools for your diabetes management, you can browse our electrical health and diagnostic collection for compatible devices and accessories.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy the Freestyle Libre 2 Plus sensor online in the UK?

You can buy the Freestyle Libre 2 Plus sensor online from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £50.99 per sensor. It is available without a prescription for adults aged 18 and over. You can also browse our full diabetes monitoring range for compatible accessories and alternative CGM products.

How does the Freestyle Libre 2 Plus sensor work in the body?

The sensor uses a tiny flexible filament inserted just beneath the skin surface to measure glucose in interstitial fluid every minute. When you scan the sensor with a compatible reader or smartphone app, it displays your current glucose level, a trend arrow, and up to 8 hours of historical data. When used with the FreeStyle LibreLink app, it can also send real-time glucose readings continuously without needing to scan.

How do I apply the Freestyle Libre 2 Plus sensor step by step?

Clean and dry the back of your upper arm, then remove the sensor from its packaging and press the applicator firmly against the skin until it clicks. The sensor will remain on your skin when you lift the applicator away. Activate it by scanning with the FreeStyle LibreLink app or compatible reader, then wait for the warm-up period before taking your first reading.

How long does the Freestyle Libre 2 Plus sensor last?

Each Freestyle Libre 2 Plus sensor lasts up to 15 days before it automatically deactivates and needs to be replaced. This is one day longer than the standard Freestyle Libre 2 sensor, which lasts 14 days. You cannot reactivate or reuse a sensor once it has expired or been removed.

What are the side effects of the Freestyle Libre 2 Plus sensor?

The most common side effects are localised skin reactions at the application site, including redness, itching, and mild irritation from the adhesive — these typically resolve after the sensor is removed. Less commonly, some people experience allergic contact dermatitis or sensor detachment before the 15-day period ends. Serious systemic allergic reactions are rare; seek immediate medical attention if you develop widespread rash, swelling, or difficulty breathing.

Who is eligible to use the Freestyle Libre 2 Plus sensor?

The sensor is suitable for adults and children aged 4 years and over who have diabetes and require glucose monitoring. Children under 18 must use it under adult supervision. It is not validated for use in pregnant women or critically ill patients without specific medical guidance, so always check with your diabetes care team first.

Can I get the Freestyle Libre 2 Plus sensor on the NHS?

NHS availability depends on your local integrated care board (ICB) criteria and your individual diabetes management needs — not everyone with diabetes automatically qualifies. Speak to your GP or diabetes nurse to find out whether you meet the eligibility criteria for NHS funding. If you don't qualify or prefer not to wait, you can purchase the sensor privately from Cured Pharmacy.

What is the difference between the Freestyle Libre 2 and the Freestyle Libre 2 Plus?

The Freestyle Libre 2 Plus sensor offers a 15-day wear duration compared to 14 days for the standard Libre 2. The key upgrade is that the Libre 2 Plus, when used with the FreeStyle LibreLink app, provides continuous real-time glucose readings without needing to scan — making it a true CGM rather than a flash monitoring system. Both devices offer high and low glucose alarms and are water-resistant to 1 metre for 30 minutes.

Is the Freestyle Libre 2 Plus sensor waterproof?

The sensor is water-resistant — not fully waterproof — and can be worn while showering, bathing, or swimming in shallow water up to 1 metre deep for a maximum of 30 minutes at a time. You should avoid submerging it beyond these limits, such as during deep-water diving. Always pat the sensor dry gently after water exposure to maintain good adhesion.

Does paracetamol affect the Freestyle Libre 2 Plus sensor readings?

Yes — high doses of paracetamol (above 1g per dose) can falsely elevate glucose readings on the Freestyle Libre 2 Plus sensor. If you need to take paracetamol for pain relief, consider using a fingerprick blood glucose test to confirm your reading during that period. You can find suitable pain relief alternatives by speaking to your pharmacist about options that don't interfere with your sensor.

How often should I scan the Freestyle Libre 2 Plus sensor?

If you are using a reader rather than the app, you should scan at least every 8 hours to ensure you capture the full glucose history stored on the sensor — data older than 8 hours is overwritten. When using the FreeStyle LibreLink app with a compatible smartphone, readings are transmitted automatically every minute, so you don't need to scan manually. Scanning more frequently gives you a more complete picture of your glucose trends throughout the day.

What happens if the Freestyle Libre 2 Plus sensor falls off early?

If the sensor detaches before the 15-day period ends, it cannot be reapplied — you will need to use a new sensor. To help prevent early detachment, ensure the skin is clean, dry, and free from lotions or oils before application. Some people use additional over-patch adhesives (available separately) to extend adhesion, particularly during exercise or in hot weather.

What are the alternatives to the Freestyle Libre 2 Plus sensor?

Alternatives include the Dexcom G7 CGM sensor, the Medtronic Guardian sensor, and traditional fingerprick blood glucose meters. The right choice depends on your diabetes type, lifestyle, and whether you need integration with an insulin pump. Browse our electrical health and diagnostic collection to compare available monitoring options.

How long can you keep using the Freestyle Libre 2 Plus sensor?

There is no defined maximum duration for using the Freestyle Libre 2 Plus system — many people with diabetes use it continuously as their primary glucose monitoring method, replacing each sensor every 15 days. Your diabetes care team will advise on whether ongoing use is appropriate for your individual management plan. Regular review appointments are recommended to assess whether the technology continues to meet your needs.

What does the latest research say about flash glucose monitoring?

Clinical evidence supports flash glucose monitoring as an effective tool for reducing hypoglycaemic episodes and improving time-in-range for people with type 1 and type 2 diabetes. NICE guidance (NG17 and NG28) recognises CGM and flash monitoring as clinically beneficial for eligible patients. Ongoing real-world studies continue to demonstrate improvements in HbA1c and quality of life for people using the Freestyle Libre system consistently.

How Should You Use the Freestyle Libre 2 Plus Sensor?

Applying the sensor correctly ensures accurate readings and reliable adhesion throughout the full 15-day wear period. Always read the instructions included in the packaging before your first application, and make sure your hands and the application site are clean and completely dry.

What Is the Correct Dose of the Freestyle Libre 2 Plus Sensor?

As a medical device rather than a medicine, there is no pharmacological dose. Each sensor is a single-use device worn continuously for up to 15 days. The table below summarises recommended use by indication and age group to help you understand how the sensor fits into your diabetes management routine.

When Is the Best Time to Use the Freestyle Libre 2 Plus Sensor?

There is no single "best" time of day to apply a new sensor — what matters most is consistency. Many people choose to apply a new sensor in the morning when they are alert and have time to follow the application steps carefully. Avoid applying the sensor immediately before exercise, swimming, or showering, as the adhesive needs time to bond securely to the skin before exposure to moisture or sweat.

If you scan using a reader rather than the app, aim to scan at least every 8 hours to avoid losing historical glucose data stored on the sensor. Scanning more frequently — particularly around meals, exercise, and bedtime — gives you a fuller picture of your glucose patterns.

How Long Can You Use the Freestyle Libre 2 Plus Sensor For?

Each individual sensor lasts up to 15 days, after which it automatically deactivates and must be replaced with a new one. There is no defined maximum duration for using the Freestyle Libre 2 Plus system overall — many people with diabetes use it as their primary glucose monitoring method on an ongoing basis, replacing sensors every 15 days. Your GP or diabetes care team will review your monitoring needs at regular appointments and advise whether continued use remains appropriate for your management plan.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

Customer Reviews

Based on 26 reviews
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Chris Hensler

Good fast delivery

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Dropped Pin Assirati

I usually get my Libra link on prescription from my pharmacy. Which cost me nothing. The only thing with Libra link is that sometimes they malfunction so they don’t last the 14days as prescribed so this is why i have purchased them from you as I don’t want to run out and not be able to get my true readings

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Alan Booth

Great service at a competitive price point.

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George Conrad

It is an amazing piece of technology. Disposal after use is a bit of a mystery!

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Anonymous

they work very well

What Are the Most Common Side Effects of the Freestyle Libre 2 Plus Sensor?

The most frequently reported side effects are localised skin reactions at the sensor application site. These are generally mild and resolve on their own once the sensor is removed after the 15-day wear period.

  • Redness or erythema at the application site
  • Itching beneath or around the adhesive patch
  • Mild skin irritation or sensitivity
  • Temporary skin indentation or mark after sensor removal
  • Minor bruising or discomfort at the insertion point

What Are the Less Common Side Effects of the Freestyle Libre 2 Plus Sensor?

Some people experience reactions that are less frequent but worth being aware of, particularly if you have sensitive skin or a history of adhesive allergies. If any of these occur and are troublesome, speak to your pharmacist or diabetes nurse.

  • Allergic contact dermatitis — a rash, blistering, or weeping at the adhesive site
  • Sensor detachment before the 15-day period ends, particularly in hot or humid conditions
  • Inaccurate glucose readings during periods of rapid glucose change (e.g. after eating or during intense exercise)
  • Skin hyperpigmentation (darkening) at repeated application sites over time

What Are the Serious Side Effects of the Freestyle Libre 2 Plus Sensor?

Serious adverse reactions are rare but can occur. A systemic allergic reaction (anaphylaxis) to sensor materials is uncommon but has been reported. Seek emergency medical attention immediately if you experience any of the following after applying the sensor:

  • Widespread skin rash or hives beyond the application site
  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Dizziness, rapid heartbeat, or feeling faint

Additionally, if the sensor gives readings that do not match your symptoms — for example, the sensor shows a normal glucose level but you feel hypoglycaemic — always perform a fingerprick blood glucose test and act on that result rather than the sensor reading.

What Should You Do If You Experience Side Effects?

For mild skin reactions, remove the sensor and allow the skin to recover before applying a new one to a different area of the upper arm. Rotating application sites with each new sensor can help reduce cumulative skin irritation. If you develop a persistent rash or suspect an allergic reaction to the adhesive, speak to your GP or pharmacist before using another sensor. You should report any serious or unexpected side effects to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can the Freestyle Libre 2 Plus Sensor Interact With Other Medicines?

The sensor itself does not interact pharmacologically with medicines, but certain substances can affect the accuracy of glucose readings. High-dose paracetamol (above 1g per dose) may falsely elevate sensor readings. High-dose ascorbic acid (vitamin C) supplements and hydroxyurea (used in some blood disorders) have also been reported to interfere with sensor accuracy. If you are taking any of these, confirm glucose readings with a fingerprick test when making treatment decisions. Always inform your diabetes care team of all medicines and supplements you are taking.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

You need the app running so it can track sugar levels all the time.

If closed, the app may miss alerts or new sugar readings.

Keeping it open makes sure your numbers stay updated and easy to see.

It helps you and your doctor trust the results from the FreeStyle Libre 2 plus sensor.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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You need the app running so it can track sugar levels all the time.

If closed, the app may miss alerts or new sugar readings.

Keeping it open makes sure your numbers stay updated and easy to see.

It helps you and your doctor trust the results from the FreeStyle Libre 2 plus sensor.