FreeStyle Libre 2 Plus Sensor

What Is the FreeStyle Libre 2 Sensor and How Can It Help You?

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 sensor is a continuous glucose monitoring (CGM) device made by Abbott that measures glucose levels in interstitial fluid through a small, flexible filament worn on the back of the upper arm. Rather than relying on repeated finger-prick tests, you simply scan the sensor with a compatible reader or smartphone to get an instant glucose reading, a trend arrow showing which direction your levels are heading, and up to 8 hours of historical data. For anyone living with type 1 or type 2 diabetes, that kind of visibility can genuinely change how you manage your condition. You can explore our full range of diabetes monitoring products at Cured Pharmacy.

The FreeStyle Libre 2 Plus Sensor is the latest iteration from Abbott, extending wear time to 15 days per sensor — one day longer than the previous FreeStyle Libre 2. It also supports real-time Bluetooth alerts for high and low glucose levels, meaning you do not have to wait until you scan to be notified of a potential problem. At £50.90 per sensor, it represents a practical option for those purchasing privately or supplementing NHS-prescribed supplies.

How Does the FreeStyle Libre 2 Plus Sensor Work?

The technology behind this sensor is called flash glucose monitoring (FGM). Here is how it works step by step:

• A tiny, flexible filament — roughly 0.4 mm in diameter — sits just beneath the surface of the skin after application.
• The filament continuously measures glucose in the interstitial fluid (the fluid surrounding your cells), which correlates closely with blood glucose levels.
• Readings are taken automatically every minute and stored on the sensor.
• When you scan the sensor with a compatible FreeStyle LibreLink app or reader, it transmits the current reading plus a trend arrow and 8-hour glucose history.
• Optional real-time alarms alert you when glucose rises above or falls below your personalised thresholds — even without scanning.

It is worth noting that interstitial glucose readings can lag behind blood glucose by approximately 5–10 minutes, particularly during rapid changes. During periods of fast glucose fluctuation — such as immediately after eating or during intense exercise — a confirmatory finger-prick test may still be advisable before making treatment decisions.

Who Should Use the FreeStyle Libre 2 Plus Sensor?

This sensor is designed for people with diabetes who need to monitor their glucose levels regularly. It is suitable for:

• Adults and children aged 4 years and over with type 1 diabetes
• Adults with type 2 diabetes who use insulin or are at risk of hypoglycaemia
• People who find frequent finger-prick testing uncomfortable or impractical
• Those who want trend data to better understand how food, exercise, and medication affect their glucose levels

It is not suitable for use during pregnancy without specific medical guidance, and it should not be used by people who are critically ill or in hospital settings where more precise blood glucose monitoring is required. Always discuss suitability with your diabetes care team before switching monitoring methods.

How Does the FreeStyle Libre 2 Plus Compare to Other CGM Options?

How Should You Store the FreeStyle Libre 2 Plus Sensor?

Proper storage is important to ensure the sensor performs accurately. Keep the FreeStyle Libre 2 sensor in its original packaging and store it below 30°C, away from direct sunlight and sources of heat. Do not freeze the sensor — freezing will damage the electrochemical components and render it unusable. Once applied to the skin, the sensor can tolerate temperatures between 10°C and 45°C. If you are travelling, avoid leaving sensors in a hot car or in checked luggage that may be exposed to extreme temperatures. You can also browse our electrical health and diagnostic range for complementary monitoring devices.

Check the expiry date printed on the packaging before use. An expired sensor may not provide accurate readings and should be disposed of safely in accordance with your local clinical waste guidelines.

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.

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 classified as a flash glucose monitoring (FGM) system. Rather than requiring multiple daily finger-prick blood tests, the sensor measures glucose in the interstitial fluid beneath the skin and transmits readings to a compatible reader or smartphone app. It is used to help people with type 1 and type 2 diabetes track glucose trends, identify patterns, and make more informed decisions about food, activity, and medication. The NHS provides this sensor on prescription to eligible patients, and it can also be purchased privately from registered pharmacies.

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

Before applying this sensor, there are several important contraindications and warnings to be aware of:

• Do not use during MRI, CT scanning, X-ray, or diathermy procedures — remove the sensor beforehand.
• Not recommended for use in critically ill patients or those in intensive care settings.
• Use with caution during pregnancy — consult your diabetes care team before use.
• Not validated for use in children under 4 years of age.
• Do not apply to areas with scarring, tattoos, or active skin conditions.
• If you experience symptoms that do not match your sensor reading, perform a finger-prick blood glucose test to confirm.
• People with known adhesive allergies should seek medical advice before use.

Regarding drug interactions, the following should be noted:

• High-dose paracetamol (acetaminophen) — doses above 1 g — may falsely elevate glucose readings from the sensor.
• Ascorbic acid (vitamin C) supplements at high doses may also interfere with sensor accuracy in some CGM systems; check the Abbott guidance for the latest information.
• No interactions with standard diabetes medications (insulin, metformin, GLP-1 agonists) have been reported in terms of sensor function.

How Should You Use the FreeStyle Libre 2 Plus Sensor?

Applying and using the sensor correctly is essential for accurate readings. Follow these steps carefully:

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 and steadily against the skin until you hear a click.
4. Remove the applicator — the sensor will remain attached to the skin.
5. Wait 60 minutes for the sensor to warm up before taking your first reading.
6. Scan the sensor with your FreeStyle LibreLink app or compatible reader to activate and begin receiving readings.
7. Scan at least every 8 hours to capture a complete glucose history — the sensor stores up to 8 hours of data.
8. Replace the sensor after 15 days.

If you are also managing other aspects of your health alongside diabetes, our vitamins and supplements range includes products that may support general wellbeing — always check with your pharmacist before adding new supplements if you use a CGM sensor.

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

Like all medical devices applied to the skin, the FreeStyle Libre 2 Plus Sensor can cause localised reactions. Most are mild and resolve on their own after the sensor is removed.

Common side effects:

• Redness at the application site
• Itching or mild irritation beneath the sensor
• Bruising or minor bleeding at insertion point
• Skin indentation after sensor removal

Less common side effects:

• Allergic contact dermatitis (rash, blistering, or swelling)
• Sensor adhesive causing skin breakdown with prolonged use
• Infection at the insertion site (rare — seek medical attention promptly if suspected)
• Discomfort or pain at the sensor site

If you develop a severe skin reaction, signs of infection (warmth, pus, increasing pain), or a systemic allergic response such as difficulty breathing or swelling of the face, remove the sensor immediately and seek urgent medical attention. You can also speak to your pharmacist for advice on managing mild skin irritation — our skin care range includes products that may help soothe minor reactions.

How Should You Store the FreeStyle Libre 2 Plus Sensor?

• Store below 30°C in a cool, dry place away from direct sunlight.
• Do not freeze — freezing permanently damages the sensor.
• Keep in original packaging until ready to use.
• Check the expiry date before each application — do not use an expired sensor.
• Once applied, the sensor tolerates temperatures between 10°C and 45°C.
• Keep out of reach of children.
• Dispose of used sensors in accordance with local clinical waste or sharps disposal guidelines — do not place in household recycling.