What Is Freestyle Libre 2 - Guide | Cured Pharmacy

What Is Freestyle Libre 2

Freestyle Libre 2 Plus Sensor

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Freestyle Libre 2 Plus Sensor

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Tarun Kumar, Prescribing Pharmacist at Cured Pharmacy

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: 21 June 2026

Last Updated: 12 August 2026

If you or someone you care for is living with diabetes, keeping track of blood glucose levels around the clock can feel like an exhausting and relentless task. Traditional finger-prick testing gives you a single snapshot of your glucose at one moment in time, but it tells you nothing about the direction your levels are heading or how they shift during the night while you sleep. That gap in knowledge is exactly where the what is Freestyle Libre 2 question becomes so relevant — this sensor-based continuous glucose monitoring system is changing how thousands of people in the UK manage their diabetes every single day, giving them real data, real insight, and real peace of mind.

Quick Summary

The Freestyle Libre 2 is a wearable continuous glucose monitoring (CGM) sensor that measures glucose levels in the interstitial fluid beneath the skin every minute, transmitting that data to a reader or smartphone when scanned. It is suitable for adults and children over four years old with Type 1 or Type 2 diabetes who want a needle-free alternative to frequent finger-prick testing.

  • Worn on the back of the upper arm for up to 14 days per sensor
  • Provides glucose readings plus an 8-hour trend graph every time you scan
  • Alerts you when glucose levels are heading dangerously high or low
  • Compatible with the LibreLink smartphone app and dedicated reader device
  • Available on NHS prescription or privately from UK pharmacies including Cured Pharmacy

Freestyle Libre 2 Glucose Level Checker

Enter your recent scanned glucose reading to see what range it falls into and what action may be appropriate. This tool is for educational purposes only and does not replace medical advice.

⚠ This widget is for informational purposes only. Always consult your diabetes care team for personalised advice.

Table of Contents

  1. What Is Freestyle Libre 2 and How Does It Work?
  2. Who Can Use the Freestyle Libre 2?
  3. How to Apply and Wear Your Sensor
  4. Real-Time Alarms and Glucose Alerts Explained
  5. Freestyle Libre 2 vs Freestyle Libre 3: Key Differences
  6. NHS Access, Private Cost, and Where to Buy
  7. Freestyle Libre 2 Comparison Table
  8. Key Takeaways
  9. When to Seek Professional Advice
  10. Frequently Asked Questions

What Is Freestyle Libre 2 and How Does It Work?

The Freestyle Libre 2 is a flash continuous glucose monitoring (CGM) system developed by Abbott. It consists of two components: a small, round sensor that you apply to the back of your upper arm, and a reader device or smartphone app that retrieves glucose data from that sensor. Unlike traditional finger-prick blood glucose meters, the Libre 2 sensor measures glucose levels in the interstitial fluid — the fluid surrounding the cells just beneath the skin — rather than directly from the blood. The sensor contains a tiny, hair-thin filament that sits just under the skin and continuously reads interstitial glucose concentrations.

What is Freestyle Libre 2 doing beneath the surface? Every minute, the sensor records a glucose measurement and stores up to eight hours of glucose history on board. When you wave the reader or your smartphone over the sensor, it retrieves all of that stored data instantly via near-field communication (NFC) technology. You then see your current glucose level, a trend arrow showing whether your glucose is rising, falling, or stable, and a graph of the past eight hours. This gives you a remarkably rich picture of your metabolic health without a single finger prick.

The sensor communicates in real time and also sends Bluetooth-enabled alarms to your connected device if glucose levels rise above or fall below your personalised thresholds. This is a significant upgrade from the original Freestyle Libre 1, which had no optional alarm functionality. The Libre 2 sensor is water-resistant up to a depth of one metre for up to 30 minutes, meaning you can shower, swim, and exercise while wearing it without worry.

  • Measures interstitial glucose every minute — not just when scanned
  • NFC scan retrieves current reading plus 8-hour trend graph
  • Bluetooth alarms alert you to low or high glucose levels automatically
  • Water-resistant to 1 metre depth for up to 30 minutes
  • Each sensor lasts 14 days before replacement is needed

Who Can Use the Freestyle Libre 2?

The Freestyle Libre 2 is indicated for use in adults and children aged four years and above who are living with diabetes and require monitoring of glucose levels as part of their diabetes management plan. It is widely used by people with Type 1 diabetes, who depend on insulin and need to understand their glucose trends throughout the day to adjust doses accurately. However, it is also increasingly used by people with insulin-requiring Type 2 diabetes and, in some cases, those with Type 2 diabetes managed with other medications where glucose variability is a clinical concern.

Understanding what is Freestyle Libre 2 suitable for means recognising that it does not fully replace finger-prick testing in all situations. You should still perform a blood glucose finger-prick check if your symptoms do not match your sensor reading, if your sensor reading is low, or if your reading is changing rapidly. The sensor is not approved for use during pregnancy as a standalone monitoring device, and certain medications that affect red blood cells — such as hydroxyurea — may cause inaccurate sensor readings.

People who are particularly likely to benefit from the Libre 2 include those who experience frequent hypoglycaemic episodes, those with hypoglycaemia unawareness (where you no longer feel warning signs of low glucose), and those who need to monitor their glucose frequently throughout the day and night. For parents of children with Type 1 diabetes, the remote monitoring functionality — using LibreLinkUp — is an especially powerful tool for keeping an eye on a child's glucose levels without disturbing their sleep.

  • Suitable for adults and children over 4 years with diabetes
  • Particularly beneficial for people with Type 1 diabetes on insulin
  • Valuable for those with hypoglycaemia unawareness or frequent hypos
  • LibreLinkUp allows a parent or carer to remotely view readings
  • Not a sole monitoring method during pregnancy — speak to your midwife and diabetes team

How to Apply and Wear Your Sensor

One of the most reassuring things people discover when they first use the Libre 2 is how straightforward the application process is. The sensor comes in a pre-packaged, single-use applicator. You clean and dry the back of your upper arm, press the applicator against your skin, and push down firmly. The applicator inserts the tiny sensing filament and leaves the round, coin-sized sensor disc stuck to your skin with a medical-grade adhesive. The whole process takes under 10 seconds and, for most people, the insertion is described as feeling like a brief flick or gentle pinch — far less uncomfortable than a conventional finger-prick.

What is Freestyle Libre 2 doing in the first hour after application? During the first 60 minutes, the sensor undergoes a warm-up period during which it is not yet providing readings. Once this is complete, it becomes active for the next 14 days. The sensor can be worn during most normal activities including exercise, bathing, and swimming within the depth and time limits specified. Abbott recommends avoiding activities involving prolonged submersion, high-altitude sports, or MRI scans while wearing the sensor.

The adhesive is designed to hold the sensor securely for the full 14-day period in most conditions, but some users find that sweating heavily during intense exercise or in hot weather may loosen the edges. There are third-party adhesive patches available to help with adhesion, and users should avoid applying the sensor over areas with scarring, inflammation, or excessive hair. Rotating the application site between uses is also a good practice to protect the skin.

  • Application takes under 10 seconds with the pre-loaded applicator
  • Allow 60-minute warm-up before first reading becomes available
  • Rotate application sites to avoid skin irritation over time
  • Use third-party adhesive patches if the sensor lifts during exercise
  • Replace every 14 days — the sensor automatically expires after this period

Real-Time Alarms and Glucose Alerts Explained

One of the most clinically important improvements the Libre 2 introduced over its predecessor is the addition of real-time Bluetooth alarms. These alarms can be set to sound an audible alert on your connected reader or smartphone when your glucose level drops below a low threshold you have personalised, or rises above a high threshold you have set. This is genuinely life-changing for people with hypoglycaemia unawareness, who may otherwise not notice the physical symptoms of a dangerous glucose low until it is already severe.

The low glucose alarm can be set as low as 3.9 mmol/L, whilst the high glucose alarm can be set up to 20.5 mmol/L. There is also a signal loss alarm that activates if the reader or phone loses Bluetooth connection with the sensor for more than 20 minutes. These alarms do not require you to actively scan the sensor — they trigger automatically in the background, which is what makes the Libre 2 a fundamentally different experience from the original Libre 1. This matters most at night, when you cannot be expected to proactively scan your sensor whilst asleep.

The LibreLinkUp app extends this functionality further by allowing up to 20 designated followers — such as a partner, parent, or healthcare professional — to receive glucose readings and alarms on their own devices. As of 2026, this has become an invaluable tool for families managing a child's diabetes or for elderly patients whose carers want oversight of overnight glucose trends without being in the same room.

  • Low glucose alarm can be set from 3.9 mmol/L upwards
  • High glucose alarm activates automatically without needing to scan
  • Signal loss alarm triggers if Bluetooth connection is interrupted for 20+ minutes
  • LibreLinkUp allows up to 20 followers to monitor your glucose remotely
  • Alarms work through the night, alerting you to dangerous overnight lows

Freestyle Libre 2 vs Freestyle Libre 3: Key Differences

A question that comes up frequently in our pharmacy is how the Libre 2 compares to the newer Freestyle Libre 3 sensor. The fundamental technology is the same — both use a subcutaneous filament to measure interstitial glucose — but the way data is delivered differs in a meaningful way. With the Libre 2, you still need to scan the sensor with your reader or phone to retrieve your current glucose reading and trend graph. The Libre 3, by contrast, automatically and continuously transmits your glucose reading to your smartphone every single minute, without you needing to do anything at all.

This makes the Libre 3 a closer match to traditional CGM devices. However, the Libre 2 remains a highly effective and widely prescribed option, particularly for people who are comfortable with the scan-to-read model and for those for whom the Libre 3 is not yet available on NHS prescription. The Libre 2 sensor is also slightly larger in its footprint, whilst the Libre 3 sensor is the smallest CGM sensor in the world at the time of writing.

For people choosing between the two privately, both the Freestyle Libre 2 Plus Sensor and the Libre 3 are available from Cured Pharmacy. The best choice depends on your personal preference for convenience, your smartphone compatibility, and the advice of your diabetes care team.

  • Libre 2: scan to read — you actively retrieve data when needed
  • Libre 3: continuous automatic transmission every minute without scanning
  • Libre 3 sensor is smaller and more discreet than the Libre 2
  • Both sensors last 14 days and require calibration-free use
  • Both work with the LibreLink smartphone app and LibreLinkUp follower functionality

NHS Access, Private Cost, and Where to Buy

In the UK, the Freestyle Libre 2 is available on NHS prescription for patients who meet the eligibility criteria set out in NICE Technology Appraisal guidance. Broadly, this includes people with Type 1 diabetes who have problematic hypoglycaemia, people who are pregnant with Type 1 diabetes, and certain groups with Type 2 diabetes who use insulin and meet specific clinical criteria. NICE guidance has been progressively updated, and as of 2026, more people are now eligible for CGM on the NHS than at any previous point.

For those who do not qualify for NHS funding, or who want to supplement their NHS sensors with additional supplies, the Libre 2 is available to purchase privately. The Freestyle Libre Two Plus Sensor is available from Cured Pharmacy with a free private prescription issued by our UK-registered prescribers, meaning you do not need to visit a GP surgery to obtain it. You can also order the Freestyle Libre 2 Sensor 1 Kit for a complete starter package including the sensor and reader if you are new to the system.

If you are already using the Libre 2 and need to read your data, the Freestyle Libre Reader flash glucose monitoring system is also available to order online, providing a dedicated alternative to using your smartphone for those who prefer a separate device. Paired with the right sensor, the reader displays all your glucose data clearly on a purpose-built screen.

  • NHS prescription available if you meet NICE eligibility criteria
  • Private purchase available through Cured Pharmacy with no GP visit needed
  • Free private prescription issued by UK-registered prescribers online
  • Sensors available individually or in multi-pack bundles for better value
  • Reader device available separately if you prefer not to use a smartphone

Freestyle Libre 2 Key Specifications at a Glance

Feature Freestyle Libre 2 Freestyle Libre 3 Traditional Finger-Prick Meter
Glucose reading method Scan to read (NFC) Automatic real-time stream Manual finger-prick blood test
Sensor wear duration 14 days 14 days N/A — no sensor used
Real-time alarms Yes — Bluetooth low/high alarms Yes — continuous Bluetooth alerts No alarm capability
Calibration required No — factory calibrated No — factory calibrated Periodic calibration of meter needed
Trend arrows Yes — shown on every scan Yes — continuous display No — single point reading only
Remote monitoring Yes — LibreLinkUp app Yes — LibreLinkUp app Not available
Water resistance 1 metre for 30 minutes Water resistant — similar rating Varies by device
NHS availability Yes — for eligible patients Yes — expanding eligibility Yes — widely available
Finger-prick needed? Sometimes — in specific situations Sometimes — in specific situations Every reading

Key Takeaways

  • The Freestyle Libre 2 is a continuous glucose monitoring sensor worn on the upper arm for 14 days, measuring interstitial glucose every minute and displaying results via scan or Bluetooth alarm
  • Real-time low and high glucose alarms are a significant clinical advantage over the original Libre 1, particularly for those with hypoglycaemia unawareness or for overnight monitoring
  • The LibreLinkUp app allows parents, carers, and healthcare professionals to remotely monitor a patient's glucose readings in real time, supporting safer diabetes management
  • NHS eligibility for CGM in the UK has expanded in 2026, but those who do not qualify can still access the Libre 2 privately through registered UK pharmacies such as Cured Pharmacy
  • The Libre 2 remains an excellent, evidence-backed option for most people with diabetes, with the Libre 3 offering continuous streaming for those who prefer an always-on approach

When to Seek Professional Advice

While the Freestyle Libre 2 is a safe, well-evidenced, and approved medical device, there are situations where speaking with a pharmacist, GP, or diabetes specialist nurse is important before, during, or after using the sensor. If you are newly diagnosed with diabetes and unsure whether CGM is appropriate for you, or if you are switching from another monitoring method, your diabetes care team should be involved in that decision. Similarly, if you experience persistent skin reactions at the sensor application site — such as redness, blistering, or irritation — you should seek clinical advice rather than simply reapplying in the same area.

Seek professional advice promptly if your sensor readings consistently differ significantly from finger-prick blood glucose results, if you experience a severe hypoglycaemic episode that required assistance from another person, if you are pregnant and managing diabetes, or if you are newly starting insulin therapy. Your diabetes team can help you interpret the glucose pattern data generated by the Libre 2 and make evidence-based adjustments to your treatment plan based on what the sensor reveals. The data the Libre 2 generates — including time-in-range statistics — is most powerful when reviewed alongside a clinician who understands your full medical history.

Scientific References

  1. National Institute for Health and Care Excellence (NICE). Technology Appraisal TA943: Continuous glucose monitoring for managing Type 1 diabetes. NICE, 2024. [Accessed 12 August 2026]
  2. Diabetes UK. Flash glucose monitors (Freestyle Libre). Diabetes UK, 2025. [Accessed 12 August 2026]
  3. Fokkert MJ et al. Performance of the FreeStyle Libre Flash Glucose Monitoring System in Patients with Type 1 and Type 2 Diabetes Mellitus. BMJ Open Diabetes Research & Care, 2020. [Accessed 12 August 2026]
  4. NICE Diagnostics Guidance DG21: FreeStyle Libre for measuring interstitial fluid glucose levels in adults with type 1 diabetes, NICE, 2017 [Accessed 12 August 2026]
  5. NICE Guideline NG17: Type 1 diabetes in adults: diagnosis and management, NICE, 2022 [Accessed 12 August 2026]
  6. FreeStyle Libre flash glucose monitoring: Diabetes UK position statement, Diabetes UK, 2019 [Accessed 12 August 2026]
  7. FreeStyle Libre 2 Sensor Summary of Product Characteristics, Electronic Medicines Compendium (EMC), Abbott, 2022 [Accessed 12 August 2026]
  8. MHRA Medical Device Alert: Flash glucose monitoring systems – guidance on use, MHRA, 2018 [Accessed 12 August 2026]
  9. BNF: Blood glucose monitoring – medical devices and diagnostics, British National Formulary, NICE, 2023 [Accessed 12 August 2026]

Ready to Try Freestyle Libre 2?

Order your Freestyle Libre 2 Plus Sensor today from Cured Pharmacy — with a free private prescription, UK-based prescribers, and discreet next-day delivery.

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Frequently Asked Questions

How long does a Freestyle Libre 2 sensor last?

A Freestyle Libre 2 sensor lasts for 14 days before it needs to be replaced. Each sensor is worn continuously on the back of the upper arm and begins warming up within 60 minutes of application, after which it provides real-time continuous glucose readings for the full two-week wear period.

Is Freestyle Libre 2 available on the NHS?

Freestyle Libre 2 is available on the NHS for eligible patients living with Type 1 or Type 2 diabetes who meet specific clinical criteria set by NICE guidelines. As of 2026, eligibility has expanded, but some patients choose to purchase sensors privately through registered UK pharmacies such as Cured Pharmacy for greater flexibility.

Can you scan Freestyle Libre 2 with a smartphone?

Yes, you can scan Freestyle Libre 2 with a compatible NFC-enabled smartphone using the LibreLink app, which is available for both iOS and Android devices. The app displays your current glucose reading, a trend arrow, and up to eight hours of glucose history each time you scan the sensor.

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

The main difference between Freestyle Libre 2 and Freestyle Libre 3 is that the Libre 3 sends continuous real-time glucose data automatically to your phone every minute without needing a scan, whereas Freestyle Libre 2 requires you to actively scan the sensor with a reader or smartphone to retrieve your glucose reading.

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