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Dexcom ONE 30 Day Starter Kit

Dexcom ONE 30 Day Starter Kit

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  • ✔️ Provides real-time glucose readings every five minutes automatically
  • ✔️ Eliminates need for routine daily finger-prick blood tests
  • ✔️ Customisable alerts warn of dangerous high or low glucose levels
  • ✔️ Water-resistant sensor suitable for swimming and exercise
  • ✔️ Covers 30 days of continuous glucose monitoring in one kit

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What Is the Dexcom ONE Starter Kit and How Does It Help?

 

Living with diabetes means keeping a close eye on your glucose levels — and that used to mean multiple finger-prick tests every single day. The Dexcom ONE starter kit changes that. It is a continuous glucose monitoring (CGM) system that measures your glucose levels automatically, every five minutes, around the clock. You get real-time readings sent straight to your smartphone, so you can see not just where your glucose is right now, but where it is heading. For anyone managing insulin-treated diabetes, that kind of insight can genuinely make a difference to daily life. You can explore our full range of diabetes monitoring products at Cured Pharmacy.

The 30 Day Starter Kit is designed for people who are new to CGM technology. It includes everything you need to get started: sensors, a transmitter, and access to the Dexcom ONE app. At £119.99, it offers a practical entry point into continuous glucose monitoring without needing a prescription.

 

How Does the Dexcom ONE Continuous Glucose Monitor Work?

 

The system works by placing a tiny sensor just beneath the surface of your skin — typically on your abdomen or the back of your upper arm. That sensor measures glucose in the interstitial fluid (the fluid surrounding your cells) rather than directly in your blood. Here is how the process works step by step:

  • A small, flexible filament is inserted subcutaneously using a one-touch applicator.
  • The sensor detects glucose electrochemically and generates a signal every five minutes.
  • A reusable transmitter clips onto the sensor and sends readings wirelessly via Bluetooth to the Dexcom ONE app.
  • The app displays your current glucose level, a trend arrow showing whether glucose is rising, falling, or stable, and a graph of your recent history.
  • Customisable alerts notify you if your glucose goes too high or too low, even while you sleep.

Each sensor lasts up to 10 days. After that, you simply remove it and apply a fresh one. The transmitter is reusable and does not need replacing with every sensor change.

 

Who Should Use the Dexcom ONE 30 Day Starter Kit?

 

This kit is intended for adults aged 18 and over who are managing diabetes with insulin therapy — whether that is multiple daily injections or an insulin pump. It is particularly useful if you find finger-prick testing disruptive, if you experience hypoglycaemia unawareness, or if you simply want a clearer picture of how food, exercise, and medication affect your glucose levels throughout the day and night.

  • Adults with type 1 diabetes using insulin.
  • Adults with type 2 diabetes on insulin therapy.
  • People who experience frequent hypoglycaemic episodes.
  • Those who want to reduce the burden of routine finger-prick testing.

It is not suitable for people undergoing dialysis, or for children under 2 years of age. Always speak to your diabetes care team before switching from finger-prick monitoring to CGM as your primary method of glucose management.

 

How Does the Dexcom ONE Compare to Other CGM Options?

 

Feature Dexcom ONE 30 Day Starter Kit FreeStyle Libre 2
Reading method Automatic every 5 minutes Scan required (plus optional alarms)
Sensor wear duration Up to 10 days Up to 14 days
Alerts and alarms Yes — customisable high/low alerts Yes — optional alarms on Libre 2
Prescription required (UK) No — available OTC No — available OTC

 

Is the Dexcom ONE Starter Kit Suitable for Everyday Use?

 

Yes. The sensor is water-resistant and can be worn during showering, swimming, and exercise. The Dexcom ONE starter kit is designed to integrate into normal daily life with minimal disruption. You can also browse our electrical health and diagnostic range for complementary monitoring devices.

Store sensors below 30°C, away from direct sunlight and moisture. Do not use a sensor past its expiry date, and always check the packaging is intact before insertion.

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

Dexcom ONE 30 Day Starter Kit specifications
Treatment category Diabetes monitoring / Continuous glucose monitoring
Mechanism of action Electrochemical interstitial glucose sensing via subcutaneous biosensor
Effective for Real-time glucose monitoring in insulin-treated diabetes
Suitable for Adults aged 18 and over with insulin-treated type 1 or type 2 diabetes
Active component Electrochemical glucose biosensor filament
Pack contents Sensors (covering 30 days), reusable transmitter, applicator
Sensor wear duration Up to 10 days per sensor
UK classification Class IIb Medical Device (CE/UKCA marked)
Device class Continuous glucose monitor (CGM)
Route of use Subcutaneous sensor insertion

Specifications of Dexcom ONE 30 Day Starter Kit

 

What Is the Dexcom ONE 30 Day Starter Kit and What Is It Used For?

 

The Dexcom ONE 30 Day Starter Kit is a continuous glucose monitoring (CGM) system used to track glucose levels in real time for people with insulin-treated diabetes. Rather than relying solely on periodic finger-prick blood tests, it provides an ongoing stream of glucose data — a reading every five minutes — helping you and your healthcare team understand your glucose patterns across the full 24-hour cycle. The NHS recognises CGM as a valuable tool for people with type 1 diabetes and for those with type 2 diabetes who use insulin and experience problematic hypoglycaemia.

 

What Do You Need to Know Before Using the Dexcom ONE?

 

Before you start using this device, there are some important contraindications and precautions to be aware of:

  • Do not use if you are on dialysis — the device has not been studied in this population and readings may be unreliable.
  • Not intended for children under 2 years of age.
  • Do not use CGM readings alone to make insulin dosing decisions if your symptoms do not match the sensor reading — always confirm with a finger-prick blood glucose test in those situations.
  • If you have known skin allergies to medical-grade adhesives, test a small area before full sensor application.
  • MRI, CT scans, and X-rays: remove the sensor and transmitter before undergoing these procedures.
  • Do not use if the sensor packaging is damaged or the expiry date has passed.

Regarding drug interactions, the following may affect sensor accuracy:

  • Hydroxyurea (used in some blood disorders and certain cancers) is known to interfere with Dexcom sensor readings and may cause falsely elevated glucose values.
  • High-dose paracetamol (acetaminophen) at doses above 1 g may affect reading accuracy on some CGM systems — check the current Dexcom ONE instructions for use for the latest guidance.

 

How Should You Use the Dexcom ONE Sensor Correctly?

 

Setting up your Dexcom ONE for the first time is straightforward, but following each step carefully ensures accurate readings and a comfortable wear experience.

  1. Download the free Dexcom ONE app on a compatible iOS or Android smartphone.
  2. Wash and thoroughly dry the insertion site — the abdomen (at least 7.5 cm from the navel) or the back of the upper arm.
  3. Remove the sensor from its sterile packaging and load it into the applicator if not pre-loaded.
  4. Press the applicator firmly against the skin and press the button to insert the sensor filament subcutaneously.
  5. Attach the reusable transmitter to the sensor by snapping it into place.
  6. Open the Dexcom ONE app and follow the on-screen instructions to pair the transmitter via Bluetooth.
  7. Wait for the two-hour warm-up period to complete before your first glucose reading appears.
  8. Set your high and low glucose alert thresholds according to your diabetes care team's guidance.
User group Recommended insertion site Sensor wear duration Calibration required?
Adults (18+) — type 1 diabetes Abdomen or upper arm Up to 10 days No routine calibration needed
Adults (18+) — insulin-treated type 2 diabetes Abdomen or upper arm Up to 10 days No routine calibration needed

 

What Are the Possible Side Effects of the Dexcom ONE?

 

As with any wearable medical device that involves skin contact and subcutaneous insertion, some people do experience local reactions. Most are mild and temporary.

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

  • Redness at the sensor insertion site
  • Mild itching or irritation under the adhesive patch
  • Minor bruising at the insertion point
  • Skin indentation after sensor removal

Less common side effects:

  • Allergic contact dermatitis to the adhesive (more likely in people with sensitive skin)
  • Bleeding at the insertion site
  • Sensor site infection (rare — seek medical advice promptly if you notice increasing redness, warmth, or discharge)

If you develop signs of a serious skin infection or a significant allergic reaction, remove the sensor and contact your GP or diabetes nurse. You can also find supportive skin care products at Cured Pharmacy if you experience mild adhesive irritation between sensor changes.

 

How Should You Store the Dexcom ONE Sensors?

 

  • Store sensors at room temperature, below 30°C.
  • Keep away from direct sunlight, heat sources, and moisture.
  • Do not refrigerate or freeze sensors.
  • Store the transmitter at temperatures between -20°C and 60°C when not in use.
  • Keep all components in their original packaging until ready to use.
  • Do not use any component past its printed expiry date.
  • Keep out of reach of children.

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 Dexcom ONE starter kit online in the UK?

You can buy the Dexcom ONE 30 Day Starter Kit directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £119.99. No prescription is required as it is available over the counter. It is also available from some high-street pharmacies and directly from the Dexcom UK website.

How does the Dexcom ONE work in the body?

The Dexcom ONE uses a tiny electrochemical biosensor inserted just beneath the skin to measure glucose in the interstitial fluid every five minutes. The sensor transmits readings wirelessly via Bluetooth to the Dexcom ONE smartphone app. This gives you a continuous, real-time view of your glucose levels and trend direction without needing to prick your finger each time.

How do I apply the Dexcom ONE sensor step by step?

Clean and dry the skin on your abdomen or upper arm, then use the one-touch applicator to insert the sensor filament subcutaneously. Snap the reusable transmitter onto the sensor, open the Dexcom ONE app, and follow the pairing instructions. Allow a two-hour warm-up period before your first reading appears on screen.

How long does each Dexcom ONE sensor last?

Each individual sensor lasts up to 10 days of continuous wear before it needs to be replaced with a new one. The 30 Day Starter Kit provides enough sensors to cover approximately one full month of monitoring. Once the 10-day period ends, the app will alert you that it is time to change your sensor.

Do I still need to do finger-prick tests when using the Dexcom ONE?

In most situations, the Dexcom ONE can replace routine finger-prick testing for people with insulin-treated diabetes. However, you should still use a blood glucose meter to confirm a reading if your symptoms do not match what the sensor is showing, or before making a critical treatment decision. Always follow the guidance of your diabetes care team regarding when finger-prick confirmation is needed.

What are the side effects of the Dexcom ONE sensor?

The most common side effects are mild skin reactions at the insertion site, including redness, itching, or minor bruising, which typically resolve after the sensor is removed. Less commonly, some people experience allergic contact dermatitis from the adhesive patch. Sensor site infection is rare but should be assessed by a healthcare professional if you notice increasing redness, warmth, or discharge.

Who is eligible to use the Dexcom ONE 30 Day Starter Kit?

The Dexcom ONE is suitable for adults aged 18 and over with type 1 or insulin-treated type 2 diabetes. It is particularly beneficial for people who experience hypoglycaemia unawareness or who find frequent finger-prick testing difficult to manage. It is not recommended for people on dialysis or for children under 2 years of age.

What happens if my Dexcom ONE sensor falls off before 10 days?

If the sensor detaches early, you will need to apply a new one as the existing sensor cannot be reinserted once removed. Using a medical-grade adhesive overpatch or tape around the edges of the sensor can help it stay in place during exercise, swimming, or hot weather. Make sure the skin is completely clean and dry before applying a new sensor.

Can I shower or swim while wearing the Dexcom ONE sensor?

Yes — the Dexcom ONE sensor and transmitter are water-resistant and designed to be worn during everyday activities including showering and swimming. The device is rated to withstand immersion in up to 2.4 metres of water for up to 24 hours. Avoid prolonged soaking in hot tubs or baths, as excessive heat and water exposure over extended periods may affect adhesion.

How does the Dexcom ONE compare to the FreeStyle Libre 2?

The Dexcom ONE provides automatic glucose readings every five minutes without any scanning required, whereas the FreeStyle Libre 2 requires you to scan the sensor to get a reading (though it also offers optional alarms). The Dexcom ONE sensor lasts up to 10 days compared to 14 days for the Libre 2. Both are available without a prescription in the UK and are suitable for insulin-treated diabetes — the right choice depends on your personal preference and lifestyle. You can browse our full diabetes monitoring range to compare options.

Does the Dexcom ONE work with an insulin pump?

The Dexcom ONE is a standalone CGM system and is not currently integrated with insulin pumps for automated insulin delivery (closed-loop systems) in the way that the Dexcom G6 or G7 can be. It is designed to work as a real-time glucose display device alongside your existing insulin delivery method, whether that is injections or a pump. Check with your diabetes team if you are considering a hybrid closed-loop system, as a different Dexcom product may be more appropriate.

What medicines can affect the accuracy of the Dexcom ONE?

Hydroxyurea is known to interfere with Dexcom sensor readings and may cause falsely elevated glucose values — do not use the Dexcom ONE if you are taking this medicine. High-dose paracetamol (above 1 g) may also affect reading accuracy on some CGM systems. Always check the current Dexcom ONE instructions for use for the most up-to-date list of interfering substances.

How long can you use the Dexcom ONE continuously?

You can use the Dexcom ONE system on an ongoing basis by replacing each sensor every 10 days and recharging the transmitter as needed. There is no defined maximum duration for continuous use — many people with insulin-treated diabetes use CGM technology indefinitely as part of their long-term diabetes management. Your diabetes care team can advise on whether ongoing CGM use is appropriate for your individual situation.

Is the Dexcom ONE available on the NHS?

The Dexcom ONE may be available on the NHS for eligible people with type 1 diabetes, subject to local commissioning decisions and NICE guidance. Availability on NHS prescription varies by region, so speak to your GP or diabetes specialist to find out whether you qualify. If you are not eligible for NHS provision, you can purchase the Dexcom ONE starter kit over the counter from Cured Pharmacy. You may also find it helpful to look at our electrical health and diagnostic collection for related monitoring products.

What are the latest studies on continuous glucose monitoring for type 2 diabetes?

Recent clinical research has shown that CGM use in people with insulin-treated type 2 diabetes can lead to meaningful reductions in HbA1c and time spent in hypoglycaemia compared to finger-prick monitoring alone. NICE updated its guidance to support CGM access for a broader range of people with diabetes, reflecting growing evidence of its clinical benefit. Speak to your diabetes care team about whether CGM is appropriate for your management plan based on the latest evidence.

How Should You Use the Dexcom ONE 30 Day Starter Kit?

Using the Dexcom ONE correctly from the start ensures you get accurate, reliable glucose readings throughout the sensor wear period. Before your first application, download the Dexcom ONE app on a compatible smartphone and create your account — the app will guide you through the entire setup process.

Rotate your insertion site with each new sensor to avoid skin irritation. Never reuse a sensor once it has been removed.

What Is the Correct Dose of the Dexcom ONE Sensor?

The Dexcom ONE is a medical device rather than a medicine, so there is no "dose" in the traditional sense. The relevant usage parameters are sensor wear duration and replacement frequency, which are outlined in the table below.

When Is the Best Time to Use the Dexcom ONE Sensor?

Apply a new sensor at a time of day when you can comfortably wait two hours for the warm-up period to complete — for example, in the morning or early evening rather than immediately before bed. This ensures your first readings are available when you are awake and able to act on any alerts. Avoid applying a new sensor immediately before strenuous exercise, as movement during the warm-up phase can occasionally affect initial accuracy.

Set your high and low glucose alert thresholds at a time when you can review them carefully with your diabetes care team's recommendations in mind. Adjusting alerts thoughtfully reduces alarm fatigue while keeping you safe.

How Long Can You Use the Dexcom ONE For?

There is no defined maximum duration for using the Dexcom ONE system. Many people with insulin-treated diabetes use CGM technology as an ongoing part of their long-term diabetes management, replacing each sensor every 10 days indefinitely. The reusable transmitter has a finite battery life and will need replacing periodically — check the Dexcom ONE instructions for use for the expected transmitter lifespan. Your diabetes care team can advise on whether continuous long-term CGM use is appropriate for your individual circumstances.

Do not exceed the recommended sensor wear duration of 10 days. If in doubt, speak to your pharmacist.

Customer Reviews

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Anonymous

Supplied as a complete starter pack but it is not. These sensors require a transmitter so this is not a complete kit. The transmitter is a further cost and that means it is far cheaper to opt for Dexcom one plus direct from Dexcom @£79 for everything.

What Are the Most Common Side Effects of the Dexcom ONE?

Because the Dexcom ONE involves inserting a small sensor filament beneath the skin and wearing an adhesive patch for up to 10 days, local skin reactions are the most frequently reported side effects. These are generally mild and resolve on their own once the sensor is removed.

  • Redness at or around the sensor insertion site
  • Mild itching under the adhesive patch
  • Minor bruising at the point of insertion
  • Skin indentation or temporary mark after sensor removal
  • Slight discomfort during sensor insertion

What Are the Less Common Side Effects of the Dexcom ONE?

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.

  • Allergic contact dermatitis — a more pronounced skin reaction to the adhesive, causing a raised, itchy rash beyond the sensor footprint
  • Bleeding at the insertion site, which is usually minor and self-limiting
  • Skin maceration (softening and breakdown) under the patch in hot or humid conditions
  • Hyperpigmentation or temporary skin discolouration at previously used sites

What Are the Serious Side Effects of the Dexcom ONE?

Serious adverse events are rare but require prompt medical attention. Sensor site infection is uncommon but can occur if the insertion site is not kept clean. Signs to watch for include increasing redness, warmth, swelling, pain, or any discharge from the insertion site. If you notice any of these, remove the sensor immediately and contact your GP or diabetes nurse. A severe allergic reaction (anaphylaxis) to any component of the device is extremely rare but constitutes a medical emergency — call 999 if you experience difficulty breathing, swelling of the face or throat, or a sudden widespread rash.

What Should You Do If You Experience Side Effects of the Dexcom ONE?

For mild skin reactions, rotating your insertion site with each new sensor and ensuring the skin is completely clean and dry before application can significantly reduce recurrence. If you experience persistent or worsening skin reactions, speak to your pharmacist or GP before applying the next sensor. They may recommend a barrier film or hypoallergenic overpatch to protect the skin. Do not ignore signs of infection — early treatment prevents complications.

Can the Dexcom ONE Interact With Other Medicines?

The Dexcom ONE is a medical device rather than a medicine, so traditional pharmacological drug interactions do not apply. However, certain medicines can interfere with the electrochemical sensor and affect the accuracy of glucose readings. Hydroxyurea is the most clinically significant — it is known to cause falsely elevated glucose readings on Dexcom sensors and the device should not be used by people taking this medicine. High-dose paracetamol (above 1 g) may also affect reading accuracy. Always inform your diabetes care team of all medicines you are taking before starting CGM therapy, and check the current Dexcom ONE instructions for use for the complete list of interfering substances.

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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