Living with diabetes means relying on your Continuous Glucose Monitor (CGM) day and night through showers, workouts, sleep, and everyday life. However, having the right CGM device is only part of the equation. The accessories you use alongside it can significantly improve sensor accuracy, comfort, and durability.
In this guide, we explore the best CGM accessories available in the UK, from adhesive patches and protective covers to companion apps, helping you get the most from your glucose monitoring system.
What Are CGM Accessories and Why Do They Matter?
CGM accessories are products designed to enhance, protect, and extend the performance of your continuous glucose monitoring device. They include:
- Adhesive patches and overpatches — to keep your sensor securely in place
- Protective sensor covers and cases — to shield your device from physical damage
- CGM companion apps — to enhance data visibility, share readings, and improve decision-making
Using the right accessories can directly impact your CGM’s accuracy. A sensor that lifts at the edges, gets knocked out of position, or is worn on irritated skin can give inconsistent readings. Investing in the right accessories is one of the simplest ways to protect your CGM data — and your health.
Section 1: Best CGM Adhesive Patches & Overpatches
Why CGM Patches Matter for Accuracy
CGM sensors must remain firmly attached to the skin to provide accurate interstitial glucose readings. When a sensor starts peeling or moving, readings can become unreliable. Adhesive overpatches reinforce the original adhesive and help keep your sensor secure throughout its full wear period.
What to Look for in a CGM Patch
Before choosing a CGM overpatch, keep these factors in mind:
- Compatibility — Does it fit your specific CGM model (Freestyle Libre 2, Libre 3, Dexcom ONE, Dexcom G7)?
- Non-stick centre zone — The best patches do not stick to the sensor itself, only to the skin. This lets you change the patch without dislodging the sensor.
- Waterproof rating — Essential for swimming, showering, and sweaty workouts.
- Hypoallergenic adhesive — Reduces the risk of skin irritation, especially for long-term wear.
- Breathable material — Allows the skin underneath to breathe and reduces moisture build-up.
Best Patches for Freestyle Libre 2 Users
The Freestyle Libre 2 is one of the most widely used CGM systems in the UK. Worn on the upper arm for up to 14 days, it needs an overpatch that balances strong adhesion with skin comfort for extended wear.
Key features to look for in a Libre 2 patch:
- Oval or circular shape designed for the Libre 2 sensor footprint
- Strong perimeter adhesion without covering the scanning window
- Availability in multiple skin-tone and coloured options
Shop FreeStyle Libre 2 at Diabetes Pharmacy UK — If you’re currently looking for replacement Freestyle Libre 2 sensors alongside your patches, Diabetes Pharmacy stocks them at competitive UK prices.
Abbott FreeStyle Libre 2 Sensor — 4 Pack — Buying in bulk alongside your patches is the most cost-effective approach for regular users.
Best Patches for Freestyle Libre 3 Users
The Freestyle Libre 3 is Abbott’s most advanced and smallest CGM sensor to date — and because it’s so compact and discreet, finding a well-fitting overpatch requires a little more care. The Libre 3 sends continuous readings straight to your smartphone, making consistent adhesion even more critical for uninterrupted data.
Look for patches specifically designed for the Libre 3’s smaller sensor profile, with:
- A non-stick centre that won’t interfere with Bluetooth transmission
- Lightweight, flexible material that moves with the body
- Hypoallergenic adhesive for the full 14-day wear period
Shop FreeStyle Libre 3 Sensor at Diabetes Pharmacy UK — The Libre 3 is available as a single sensor for those who self-fund their CGM outside the NHS.
FreeStyle Libre 3 CGM Sensor — Single — Stock up on sensors and order patches from a reliable supplier to maintain uninterrupted monitoring.
Best Patches for Dexcom ONE Users
The Dexcom ONE is a popular real-time CGM with a 10-day wear period. Its sensor is slightly raised compared to the Libre range, which means overpatches need a deeper centre cut-out to sit comfortably without pressing on the transmitter.
What makes a great Dexcom ONE patch:
- A generously sized oval design that wraps around the sensor base
- Strong, water-resistant adhesive rated for sporting activity
- Breathable outer fabric layer that doesn’t create a humid environment under the sensor
Dexcom ONE Transmitter — Diabetes Pharmacy UK — If you use the Dexcom ONE system, Diabetes Pharmacy stocks the transmitter at UK-competitive prices.
Dexcom ONE Sensor — 3 Pack — Each sensor lasts up to 10 days, giving you 30 days of continuous monitoring per pack. Pairing these with quality overpatches ensures you get the full wear duration from every sensor.
Section 2: CGM Sensor Covers & Protective Cases
Why CGM Covers Improve Accuracy
While patches keep the sensor adhered to the skin, protective covers address a different problem: physical damage. A knocked CGM sensor can shift position beneath the skin, cause localised tissue pressure, or simply fall off entirely — all of which affect reading accuracy and require premature replacement.
Protective sensor covers typically take one of two forms:
- Silicone gel skins — Soft, form-fitting covers that snap over the sensor housing and protect against bumps and knocks while remaining flexible for daily movement.
- Hard shell cases — Designed for high-impact activities like contact sports or outdoor pursuits, these offer rigid protection while still allowing the sensor to function normally.
Key Benefits of Using Sensor Covers
- Extended sensor life — Protecting the sensor from accidental bumps reduces early sensor failures
- Improved reading stability — A cover prevents the sensor from shifting position during sleep or exercise
- Sweat and moisture management — Some covers wick moisture away from the sensor site, improving adhesion and comfort
- Personalisation — Covers come in dozens of colours and designs, which many CGM users — particularly children — find helpful for normalising their device
Tips for Choosing the Right Cover
- Always match the cover to your exact CGM model — a Libre 3 cover will not fit a Libre 2, and vice versa
- Choose silicone covers for everyday use and hard-shell options for contact sports or outdoor activities
- Ensure the cover does not obstruct the sensor’s NFC or Bluetooth window
- For children, consider bold colours or character designs to make wearing the device more positive
Section 3: Best CGM Companion Apps for Better Accuracy
While patches and covers protect your sensor physically, CGM apps enhance how you interpret and act on your glucose data. The right app can transform raw numbers into meaningful insights — and better data interpretation leads to more accurate diabetes management decisions.
FreeStyle LibreLink App
The LibreLink app is Abbott’s official companion app for Freestyle Libre 2 and Libre 3 sensors. For Libre 3 users, it provides continuous glucose readings sent directly to your smartphone without needing to scan the sensor.
Key features:
- Real-time glucose readings with trend arrows (Libre 3)
- Customisable high and low glucose alarms
- 8-hour historical data storage
- Ambulatory Glucose Profile (AGP) report generation
- Works with LibreLinkUp to share readings with caregivers and family members in real-time
Best for: Freestyle Libre 2 and Libre 3 users who want official, well-integrated glucose monitoring on their smartphone.
FreeStyle Libre 2 Sensor — Diabetes Pharmacy UK — The LibreLink app is free and works seamlessly with all Libre 2 and Libre 3 sensors stocked at Diabetes Pharmacy.
Dexcom ONE App
The Dexcom ONE app provides real-time glucose readings from the Dexcom ONE sensor directly to a compatible Android or iOS device — no separate receiver required.
Key features:
- Real-time blood glucose readings every 5 minutes
- Urgent low glucose alert at 3.1 mmol/L
- Trend graph showing glucose direction and rate of change
- Share readings with up to 10 followers via the Dexcom Follow app
- Compatible with Apple Watch for wrist-based readings
Best for: Dexcom ONE users who want real-time CGM data with reliable alarms.
Dexcom ONE Sensor 3-Pack — Diabetes Pharmacy UK — Get more from your Dexcom ONE app by ensuring you always have a fresh sensor available.
LibreLinkUp — Caregiver Sharing App
LibreLinkUp is a free companion app that allows parents, partners, and caregivers to follow a CGM user’s glucose readings in real-time — on their own smartphone. It’s particularly valuable for parents of children with type 1 diabetes who use the Freestyle Libre system.
Key features:
- Real-time glucose sharing with up to 20 followers
- Alarms notify followers if glucose goes too high or too low
- Trend graphs and historical data visible to followers
- Works across iOS and Android
Best for: Parents of children with diabetes or anyone whose loved one uses a Freestyle Libre CGM.
Sugarmate (Dexcom Integration)
Sugarmate is a third-party app that integrates with Dexcom CGM systems and provides a more feature-rich data display than the standard Dexcom app. It was acquired by Tandem Diabetes Care and remains a popular choice for Dexcom users who want enhanced visualisation.
Key features:
- Glucose reading notifications on Apple Watch, lock screen, and widgets
- Caller ID-style alerts for urgent glucose events
- Trend analysis and time-in-range reporting
- Nightscout integration for advanced users
Best for: Advanced Dexcom users who want richer data display and notification options.
Section 4: Finger-Prick Calibration Tools — Still Relevant in 2026
Even with the most advanced CGM system, there are moments when a calibration finger-prick provides a useful accuracy check — particularly during rapid glucose changes, when your readings don’t match how you feel, or before making a critical dosing decision.
Having a reliable lancing device and quality test strips ensures you always have a backup verification method.
Accu-Chek FastClix Lancing Device
The Accu-Chek FastClix is widely regarded as one of the most comfortable and convenient lancing devices available in the UK. Its 6-lancet drum system means you can take up to 6 readings before needing to change lancets — with a single one-click operation each time.
Why it pairs well with CGM use:
- Minimises pain — important for spot-check calibration when CGM readings need verification
- 11 depth settings for different skin types and finger locations
- Drum system reduces lancet handling and contamination risk
Buy Accu-Chek FastClix Lancing Device — Diabetes Pharmacy UK — Available at £12.99, it’s a worthwhile addition to any CGM user’s kit.
GlucoRx Sterile Lancets (30g) — 200 Pack
For CGM users who occasionally need to finger-prick for calibration or verification, the GlucoRx Sterile Lancets offer an affordable, high-quality option in bulk.
Features:
- 30 gauge — ultra-fine for minimal discomfort
- Sterile, single-use lancets
- Compatible with most standard lancing devices
Buy GlucoRx Sterile Lancets 200 Pack — Diabetes Pharmacy UK — Priced at £7.99 for 200 lancets, this is one of the most cost-effective backup options for CGM users in the UK.
Accu-Chek Aviva Test Strips (50 Pack)
If you use an Accu-Chek meter as your backup verification device alongside a CGM, the Accu-Chek Aviva Test Strips offer reliable, clinically validated blood glucose results.
Buy Accu-Chek Aviva Test Strips — Diabetes Pharmacy UK — Compatible with Accu-Chek Aviva, Aviva Nano, Aviva Combo, and Aviva Expert meters.
Section 5: Practical Tips to Maximise CGM Accuracy
Even with the best accessories, CGM accuracy depends on how you use and maintain your device. Here are the most impactful tips for 2026:
- Rotate Your Sensor Site
Repeatedly placing your CGM in the same spot can cause lipohypertrophy — a build-up of scar tissue that affects sensor accuracy. Rotate between different areas of the upper arm and keep at least 2–3 cm away from your last site.
- Apply Your Patch Correctly
- Ensure the skin is clean, dry, and free of lotions before applying an overpatch
- Apply from the centre outward, smoothing out any bubbles
- Press down firmly around all edges, especially near the sensor border
- Warm Up Your Sensor
Allow new CGM sensors a full two-hour warm-up period before trusting readings. Some systems may require a calibration finger prick in the first hour to establish a baseline reading.
- Stay Hydrated
CGM sensors measure glucose in interstitial fluid. Dehydration reduces interstitial fluid volume, which can cause readings to lag behind actual blood glucose levels more significantly than usual.
- Avoid Placing Sensors Near Muscle Groups That Flex
The back of the upper arm is the recommended placement for most UK CGM devices. Avoid areas that flex repeatedly during workouts (e.g., the inner arm or forearm) as movement can dislodge the sensor filament and affect accuracy.
- Verify During Rapid Changes
CGM readings can lag behind blood glucose by 5–15 minutes during rapid glucose changes (post-meal spikes or fast-acting insulin drops). If your readings don’t match your symptoms during these windows, use a calibration finger-prick for confirmation.
Quick Comparison: Which CGM Accessories Do You Need?
Accessory Type | Best For | CGM Compatibility |
Adhesive Overpatch | Extending sensor wear, active lifestyles | Libre 2, Libre 3, Dexcom ONE |
Silicone Sensor Cover | Daily protection, children’s use | Libre 2, Libre 3, Dexcom ONE |
LibreLink App | Real-time data, Libre users | Freestyle Libre 2 & 3 |
Dexcom ONE App | Real-time data, Dexcom users | Dexcom ONE |
LibreLinkUp App | Caregiver sharing | Freestyle Libre 2 & 3 |
Lancing Device | CGM backup verification | Any CGM system |
Test Strips | Calibration & accuracy checks | Any CGM system |
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Where to Buy CGM Accessories and Sensors in the UK
All the CGM sensors referenced in this guide are available through Diabetes Pharmacy UK — a trusted UK-based online pharmacy specialising in diabetes care products, with competitive pricing and fast, discreet delivery.
Key products available at Diabetes Pharmacy UK:
- FreeStyle Libre 2 Sensor — £47.00
- FreeStyle Libre 2 Sensor — 4 Pack — Best value multi-pack
- FreeStyle Libre 3 Sensor — £60.99
- FreeStyle Libre 3 CGM Sensor — Single sensor
- Dexcom ONE Transmitter
- Dexcom ONE Sensor — 3 Pack
- Accu-Chek FastClix Lancing Device — £12.99
- GlucoRx Sterile Lancets 200 Pack — £7.99
- Accu-Chek Aviva Test Strips 50 Pack
Final Verdict
Getting the most from your CGM goes well beyond the sensor itself. The right adhesive patch keeps your readings stable by keeping the sensor in place. A good companion app transforms data into actionable insight. And a reliable backup lancing device ensures you always have a way to verify your readings when it matters most.
Whether you use a Freestyle Libre 2, Libre 3, or Dexcom ONE, pairing your CGM with the right accessories will make a real difference to your monitoring accuracy, device longevity, and overall quality of life with diabetes.
For genuine UK-stocked CGM sensors and diabetes supplies at competitive prices, visit Diabetes Pharmacy UK — trusted by hundreds of UK customers for fast, discreet delivery of the devices they rely on every day.
