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Freestyle Libre Two Plus Sensor

Freestyle Libre Two Plus Sensor

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  • ✔️ Provides real-time glucose readings every minute for 15 days
  • ✔️ No routine finger-prick scanning required for calibration
  • ✔️ Optional high and low glucose alarms for proactive management
  • ✔️ Water-resistant to 1 metre — suitable for swimming and exercise
  • ✔️ Suitable for adults and children aged 4 and over with diabetes

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What Is the Freestyle Libre 2 Plus Sensor?

 

Managing diabetes day to day involves a lot of decisions — and having accurate, real-time glucose data makes those decisions considerably easier. The Freestyle Libre 2 Plus sensor is Abbott's latest continuous glucose monitoring (CGM) sensor, designed to give people with diabetes a clearer, more immediate picture of their glucose levels without the need for routine finger-prick scanning. At £50.90 per sensor, it represents a meaningful step forward in accessible glucose monitoring for UK patients. If you're exploring your options for diabetes monitoring, this sensor is worth understanding in detail.

Unlike earlier flash glucose monitoring systems that required you to actively scan the sensor to get a reading, the Freestyle Libre 2 Plus transmits glucose data continuously and in real time — every single minute — to a compatible reader or smartphone app. It also includes optional real-time glucose alarms, alerting you when levels are trending too high or too low, even before you check your phone or reader.

 

How Does the Freestyle Libre 2 Plus Sensor Work?

 

The sensor works by measuring glucose in the interstitial fluid — the fluid that surrounds your body's cells just beneath the skin — rather than directly in the blood. A tiny, flexible filament sits just under the surface of the skin on the back of your upper arm. This filament contains an electrochemical biosensor that reacts with glucose molecules and generates a signal proportional to the glucose concentration present.

  • The sensor is applied using a single-use applicator — no manual insertion required.
  • After a one-hour warm-up period, it begins transmitting glucose readings automatically.
  • Readings are sent every minute to a compatible LibreLink app (iOS or Android) or the Freestyle Libre 2 Plus reader device.
  • The sensor stores up to eight hours of glucose data, so readings are not lost if your phone is out of range.
  • Optional alarms can be configured to alert you when glucose rises above or falls below your personalised thresholds.

Because the sensor is factory-calibrated, there is no need for routine finger-prick blood glucose tests to calibrate the device. This makes daily use considerably more straightforward.

 

Who Should Use the Freestyle Libre 2 Plus Sensor?

 

The Freestyle Libre 2 Plus sensor is suitable for adults and children aged 4 years and over who have diabetes and need to monitor their glucose levels regularly. It is particularly well-suited to people who find frequent finger-prick testing burdensome, those on insulin therapy who need to track glucose trends closely, and anyone who wants the reassurance of real-time alerts.

  • Adults with type 1 or type 2 diabetes requiring regular glucose monitoring.
  • Children aged 4 and over (sensor must be applied and managed by a caregiver for younger children).
  • People on insulin who need to understand glucose trends to adjust doses safely.
  • Individuals who want to reduce reliance on finger-prick testing in daily life.

It is not suitable for use during MRI, CT scans, X-rays, or diathermy procedures. Always speak to your diabetes care team before starting any new monitoring system, particularly if you are pregnant or have recently changed your insulin regimen.

 

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

 

Feature Freestyle Libre 2 Plus Freestyle Libre 2
Wear duration 15 days 14 days
Real-time glucose transmission Yes — every minute Scan required for reading
Optional glucose alarms Yes Yes
Factory calibrated Yes — no finger-prick calibration needed Yes
Water resistance 1 metre / 30 minutes 1 metre / 30 minutes

 

How Should You Store the Freestyle Libre 2 Plus Sensor?

 

Proper storage is important to ensure the sensor performs accurately. Store the Freestyle Libre 2 Plus sensor below 30°C, away from direct sunlight and sources of heat. Do not freeze the sensor — freezing will damage the biosensor filament and render it unusable. Once applied to the skin, the sensor operates within a temperature range of 10°C to 45°C.

Check the expiry date printed on the packaging before applying each sensor. Using an expired sensor may result in inaccurate readings. If you have any concerns about sensor performance or storage, contact your diabetes care team or speak to a pharmacist. You can also explore our wider range of electrical health and diagnostic products for complementary monitoring tools.

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 Two Plus Sensor specifications
Treatment category Continuous glucose monitoring (CGM)
Mechanism of action Electrochemical interstitial fluid glucose biosensor
Effective Provides real-time glucose readings every minute for up to 15 days
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)
Preparation Wearable subcutaneous sensor with adhesive patch
Route of administration Subcutaneous (applied to back of upper arm)

Specifications of Freestyle Libre Two 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 manufactured by Abbott and is intended to replace or significantly reduce the need for routine finger-prick blood glucose testing. The sensor measures glucose in interstitial fluid and transmits readings in real time to a compatible smartphone app or dedicated reader device.

It is used to help people with type 1 or type 2 diabetes understand their glucose trends, make informed decisions about food, activity, and insulin dosing, and receive alerts when glucose levels move outside their target range. The NHS recognises continuous glucose monitoring as an important tool in diabetes management, particularly for people on insulin therapy.

 

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

 

Before applying the sensor, it is important to be aware of the following contraindications and warnings:

  • Do not use during MRI, CT scans, X-rays, or diathermy — the sensor may be damaged and could cause skin burns.
  • Not recommended for use in critically ill patients or those in intensive care settings without clinical supervision.
  • Children under 4 years of age should not use this sensor.
  • If you are pregnant, consult your diabetes care team before use — glucose targets and monitoring needs differ during pregnancy.
  • Do not apply to skin that is irritated, damaged, or has active skin conditions such as eczema or psoriasis at the application site.
  • People with known adhesive allergies should seek medical advice before use.

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.
  • Rapid changes in glucose levels (e.g. during or immediately after intense exercise) may cause a lag between sensor and blood glucose readings.

 

How Should You Use the Freestyle Libre 2 Plus Sensor?

 

Applying the sensor correctly is straightforward, but following each step carefully ensures accurate readings and good adhesion throughout the 15-day wear period.

  1. Wash and dry your hands thoroughly before handling the sensor.
  2. Choose a site on the back of your upper arm — avoid areas with moles, tattoos, scars, or injection sites.
  3. Clean the skin with an alcohol wipe and allow it to dry completely (at least 10 seconds).
  4. Remove the sensor from its packaging and check the expiry date.
  5. Press the applicator firmly against the skin until you hear a click — the sensor is now applied.
  6. Remove the applicator. The sensor should sit flat against the skin.
  7. Open the LibreLink app or turn on your reader and scan the sensor to activate it.
  8. Wait one hour for the warm-up period to complete before relying on readings.
  9. Set your glucose alarm thresholds in the app according to your diabetes care team's guidance.
Indication Age Group Sensor Wear Duration Frequency of Replacement
Type 1 or Type 2 diabetes glucose monitoring Adults (18+) Up to 15 days per sensor Every 15 days
Paediatric diabetes glucose monitoring Children aged 4–17 Up to 15 days per sensor Every 15 days (caregiver-managed)

 

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

 

As with any wearable medical device, some people experience reactions at the application site. Most are mild and resolve on their own once the sensor is removed. If you are managing other aspects of your health alongside diabetes, our skin care range includes products that may help soothe minor skin irritation.

Common side effects (may affect more than 1 in 10 users):

  • Redness at the application site
  • Itching beneath or around the sensor adhesive
  • Minor bruising or discomfort at the insertion point
  • Skin indentation after sensor removal

Less common side effects:

  • Allergic contact dermatitis from the adhesive
  • Localised swelling or raised skin reaction
  • Sensor detachment before the 15-day period ends (particularly in hot or humid conditions)
  • Inaccurate readings during periods of rapid glucose change

Serious allergic reactions are rare. If you develop widespread rash, difficulty breathing, or significant swelling, remove the sensor and seek urgent medical attention.

 

How Should You Store the Freestyle Libre 2 Plus Sensor?

 

  • Store at room temperature, below 30°C.
  • Do not freeze — freezing permanently damages the biosensor.
  • 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 operates between 10°C and 45°C.

If you are building a broader diabetes management routine, it is worth exploring vitamins and supplements that support general metabolic health, alongside your glucose monitoring plan. Always discuss any supplements with your diabetes care team first.

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 from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £50.90 per sensor. It is also available from some high-street pharmacies and on NHS prescription for eligible patients with diabetes. Eligible patients should speak to their GP or diabetes nurse about accessing it through the NHS.

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

The sensor uses a tiny electrochemical filament inserted just beneath the skin of the upper arm to measure glucose in interstitial fluid — the fluid surrounding your body's cells. It transmits a glucose reading every minute to a compatible app or reader, giving you a continuous picture of your glucose trends. This is different from a blood glucose meter, which only gives a single snapshot reading at the moment of testing.

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

Clean and dry the back of your upper arm, then press the sensor applicator firmly against the skin until it clicks into place. Remove the applicator, open the LibreLink app or reader, and scan the sensor to activate it. Allow one hour for the warm-up period before relying on readings.

How long does the Freestyle Libre 2 Plus sensor last?

Each sensor lasts up to 15 days before it needs to be replaced, which is one day longer than the previous Freestyle Libre 2 sensor. Once the 15-day period ends, the sensor automatically deactivates and a new one must be applied. You cannot extend the wear period beyond 15 days.

Do I still need to do finger-prick tests with the Freestyle Libre 2 Plus?

The Freestyle Libre 2 Plus is factory-calibrated and does not require routine finger-prick blood glucose tests to calibrate the sensor. However, your diabetes care team may advise a confirmatory finger-prick test in certain situations — for example, if your symptoms do not match what the sensor is showing. Always follow the guidance of your healthcare team.

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

NHS eligibility for funded CGM sensors is guided by NICE and NHS England criteria, which generally include people with type 1 diabetes and certain groups with type 2 diabetes on insulin. Your GP or diabetes specialist nurse can confirm whether you qualify for NHS-funded access. If you do not meet NHS criteria, you can purchase the sensor privately from our diabetes monitoring range.

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, or mild rash caused by the adhesive. These typically resolve once the sensor is removed after 15 days. Serious allergic reactions are rare — if you experience widespread rash, swelling, or difficulty breathing, remove the sensor and seek urgent medical attention.

Can I wear the Freestyle Libre 2 Plus sensor while swimming or exercising?

Yes, the sensor is water-resistant to a depth of 1 metre for up to 30 minutes, making it suitable for showering, swimming, and most forms of exercise. Avoid prolonged submersion beyond these limits, as this may compromise the sensor's adhesion or performance. Vigorous exercise can also cause a temporary lag between sensor and blood glucose readings due to rapid glucose changes.

What happens if my 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 completely clean and dry before application, and avoid applying lotions or oils to the area. Some people use additional medical-grade adhesive patches over the sensor in hot or humid conditions.

What medicines can affect the Freestyle Libre 2 Plus sensor readings?

High-dose paracetamol (above 1g per dose) may falsely elevate glucose readings on the sensor. High-dose vitamin C (ascorbic acid) supplements may also interfere with accuracy. Always inform your diabetes care team of any medicines or supplements you are taking so they can advise on how to interpret your readings correctly.

What is the difference between the Freestyle Libre 2 Plus and the Freestyle Libre 3?

The Freestyle Libre 3 is a smaller, slimmer sensor that also provides real-time continuous glucose readings and lasts 14 days, whereas the Freestyle Libre 2 Plus lasts 15 days. Both offer optional glucose alarms and do not require routine finger-prick calibration. The choice between them may depend on availability, NHS prescribing decisions, and personal preference — speak to your diabetes team for guidance.

Can children use the Freestyle Libre 2 Plus sensor?

Yes, the sensor is approved for use in children aged 4 years and over. For younger children, a parent or caregiver should apply and manage the sensor. The sensor should be placed on the back of the upper arm, and the caregiver should monitor readings and alarm settings on the connected app or reader.

How long can you use the Freestyle Libre 2 Plus sensor for overall?

There is no defined maximum duration for using the Freestyle Libre 2 Plus system — it is intended for ongoing, long-term glucose monitoring in people with diabetes. Each individual sensor lasts 15 days, after which you apply a new one. Your diabetes care team will advise on whether continuous glucose monitoring remains appropriate for your situation over time.

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

Alternatives include the Freestyle Libre 3 (also by Abbott), the Dexcom G7, and the Medtronic Guardian sensor, each with different wear durations, accuracy profiles, and compatibility with insulin pumps. Traditional finger-prick blood glucose meters remain an option for those who do not require continuous monitoring. Browse our electrical health and diagnostic range to compare available options.

What does the latest research say about continuous glucose monitoring with the Freestyle Libre system?

Clinical studies have shown that flash and continuous glucose monitoring systems, including the Freestyle Libre range, are associated with reductions in time spent in hypoglycaemia and improvements in HbA1c in people with type 1 diabetes. NICE guidance supports the use of CGM in people with type 1 diabetes as part of a structured diabetes management plan. Research into CGM use in type 2 diabetes is ongoing, with emerging evidence supporting its use in insulin-treated patients.

How Should You Use the Freestyle Libre 2 Plus Sensor?

Applying the sensor correctly from the start makes a real difference to how well it performs over its 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 before you begin.

Follow these steps each time you apply a new sensor:

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

The Freestyle Libre 2 Plus is a medical device rather than a medicine, so there is no pharmacological dose. Each sensor is a single-use device worn continuously for up to 15 days. One sensor is applied at a time, and it must be replaced at the end of the 15-day period — it cannot be reused or extended.

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 — you can apply it at any time that is convenient for you. However, many people choose to apply a new sensor in the morning so that the one-hour warm-up period is complete before meals and any insulin doses are due. Avoid applying the sensor immediately before sleeping, as you will not be able to confirm it has activated correctly.

Once activated, the sensor works continuously around the clock, including overnight. This means you can benefit from nocturnal glucose trend data and low-glucose alarms while you sleep — something that is particularly valuable for people at risk of nocturnal hypoglycaemia.

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

Each individual sensor is worn for up to 15 days, after which it must be replaced with a new one. There is no defined maximum duration for using the Freestyle Libre 2 Plus system overall — it is designed for ongoing, long-term glucose monitoring in people with diabetes who require regular glucose data. Your diabetes care team will review whether continuous glucose monitoring remains appropriate for your needs at each clinical review.

Rotate the application site with each new sensor to reduce the risk of skin irritation or localised tissue changes. Avoid reusing the same spot on the arm consecutively.

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

Customer Reviews

Based on 12 reviews
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A
Anonymous

Generally good. Tends to have blood readings higher than fingerpick.
Has occasional failed safety checks, but you can claim from the product company

A
Anonymous

Great price, Fast delivery.

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Darren Harris

Fantastic service with quick delivery

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Anonymous

Brilliant and the only took a few days to arrive so really good thankyou m Routledge

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Glenn Mason

Too expensive

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

Most people tolerate the Freestyle Libre 2 Plus sensor well, but some experience mild reactions at the application site. These are typically related to the adhesive patch rather than the sensor filament itself, and they usually resolve within a few days of removing the sensor.

  • Redness or erythema at the application site
  • Itching beneath or around the adhesive patch
  • Minor bruising or tenderness at the insertion point
  • Skin indentation or temporary mark after sensor removal
  • Mild discomfort during or immediately after application

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

A smaller number of users experience more noticeable skin reactions, particularly those with sensitive skin or a history of adhesive allergies. These are less common but worth being aware of before you start using the sensor.

  • Allergic contact dermatitis — a raised, blistering, or weeping rash at the adhesive site
  • Localised swelling around the sensor
  • Sensor detachment before the 15-day period ends, particularly in hot or humid conditions
  • Temporary inaccurate readings during periods of rapid glucose change, such as immediately after intense exercise
  • Pressure-related discomfort if the sensor is pressed against a surface during sleep

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

Serious adverse reactions are rare but can occur. If you experience any of the following, remove the sensor immediately and seek urgent medical attention. Do not reapply a new sensor until you have spoken to a healthcare professional.

  • Widespread skin rash beyond the application site
  • Significant swelling of the arm, face, or throat
  • Difficulty breathing or swallowing
  • Signs of infection at the insertion site — increasing pain, warmth, pus, or fever

What Should You Do If You Experience Side Effects?

For mild skin reactions such as redness or itching, rotating the application site with each new sensor and ensuring the skin is completely clean and dry before application can help reduce recurrence. If you have sensitive skin, speak to your diabetes care team — they may be able to recommend a suitable barrier product to apply around (not under) the sensor adhesive.

If you experience a more significant reaction, remove the sensor and contact your GP or pharmacist. You should also report any serious adverse reactions to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk, as this helps improve device safety monitoring for all users.

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

The Freestyle Libre 2 Plus is a medical device and does not interact with medicines in the pharmacological sense. However, certain substances can affect the accuracy of glucose readings produced by the sensor. High-dose paracetamol (acetaminophen) — doses above 1g — may cause the sensor to display falsely elevated glucose readings. High-dose ascorbic acid (vitamin C) supplements may also interfere with sensor accuracy in some users.

Always inform your diabetes care team of all medicines, supplements, and over-the-counter products you are taking. If you suspect a reading is inaccurate — particularly if it does not match your symptoms — perform a confirmatory finger-prick blood glucose test before making any treatment decisions.

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

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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