FAQ Continuous glucose monitoring

FAQ Continuous glucose monitoring

LinX Continuous Glucose Monitoring (CGM) is a system that monitors glucose levels in real time, 24 hours a day.

Glucose readings are sent directly to the connected mobile app, allowing users to track:

  • current glucose levels,

  • glucose trends,

  • and the rate at which glucose levels are rising or falling.

LinX CGM can also alert users when glucose levels drop too low or rise too high, supporting safety, metabolic health, and performance optimization.

LinX CGM allows users to monitor glucose levels continuously, day and night, without the need for an external transmitter.

After application, a small sensor is placed under the skin and held in place with an adhesive patch. The sensor measures glucose levels in the interstitial fluid beneath the skin and transmits the data directly to the mobile app via wireless connection.

This enables real-time glucose monitoring without routine finger-prick testing.

After eating, glucose from food enters the bloodstream and then moves into the interstitial fluid. Because glucose reaches the interstitial fluid slightly later than the blood, CGM readings may differ slightly from finger-stick blood glucose measurements. This delay is normal and does not reduce the clinical or practical value of continuous glucose monitoring.

Compared with traditional glucose measurement methods, CGM allows the detection of hidden glucose fluctuations, including hyperglycemia and hypoglycemia episodes that may otherwise go unnoticed, such as afternoon glucose spikes or asymptomatic nighttime hypoglycemia.

Continuous glucose monitoring helps users better understand how glucose behaves in the body and how it is influenced by multiple factors, including food choices, physical activity, training intensity, stress, recovery, treatment plans, sleep, and psychological factors. It also makes it easier to recognize glucose patterns such as afternoon hyperglycemia, the Dawn Phenomenon, the Somogyi effect, and other trends that are difficult to identify with occasional finger-stick measurements.

By providing detailed, continuous data, CGM supports the development of individualized diabetes management plans, lifestyle adjustments, and performance optimization strategies. It improves treatment effectiveness, supports better long-term adherence, and serves as a powerful visual tool for glucose education and self-awareness.

The LinX CGM system automatically and continuously measures glucose levels without the need for routine calibration. This significantly reduces the need for finger-stick testing, making glucose monitoring more comfortable and less invasive for people with diabetes, while also offering a practical and insightful solution for athletes, fitness enthusiasts, and other users interested in metabolic health.

Glucose readings are easily accessible directly on a smartphone. LinX CGM operates 24/7, including during sleep, and displays the current glucose level, historical data (up to 14 days), glucose trends (rising, falling, or stable), and the rate of change. This allows users to quickly understand not only their current glucose level but also where it is heading.

With access to detailed glucose patterns, users can make more informed decisions in everyday life. CGM data help analyze how stress, nutrition, exercise, recovery, and daily routines affect glucose levels at different times of the day, enabling timely adjustments and helping prevent sudden glucose fluctuations.

When alerts are enabled, the LinX app can notify users if glucose levels fall below or rise above predefined thresholds. This supports early intervention and helps reduce the risk of dangerous hypoglycemic or hyperglycemic episodes, both during the day and at night. Alert settings can be customized to suit individual needs and lifestyles.

Knowing that glucose levels are being continuously monitored provides a greater sense of safety and emotional comfort. Users can engage more confidently in daily activities and sleep more peacefully at night. Many CGM users report improved quality of life, better glucose awareness, and increased confidence in managing their health.

In certain situations, a finger-stick blood glucose test may still be required, for example if symptoms do not match CGM readings or when clinically necessary.

LinX CGM measures glucose levels in interstitial fluid, while blood glucose meters measure glucose directly in the blood.

Small differences between readings are normal because changes in blood glucose appear a few minutes earlier than in interstitial fluid.

If CGM readings do not match symptoms, it is recommended to perform a finger-stick test and base treatment decisions on the blood glucose meter result.

Occasional differences between blood glucose meter (BGV) and CGM readings are normal and may occur due to:

  • inaccurate finger-stick sampling (e.g., unclean skin),

  • rapid glucose changes,

  • pressure on the sensor (for example, sleeping on it).

If CGM readings consistently differ from multiple blood glucose meter measurements, sensor calibration may be performed.

Calibration recommendations:

  • calibrate only when glucose levels are stable,

  • avoid calibration on the first day of sensor use,

  • do not calibrate more than once per day.

Blood glucose meter readings can also be manually logged in the mobile app if desired.

Using a Linx continuous glucose monitoring (CGM) system can help you make better decisions about your diabetes management and treatment, thanks to the detailed data it provides.

The information provided by CGM allows you to identify patterns and factors that individually affect your glucose levels, helping you make more accurate and effective changes to your daily routine and treatment.

Android:

  • Android operating system version 10.0 or later is required.
  • For Huawei devices, HarmonyOS 2 or later is required.
  • The app functions correctly only when Bluetooth and Location services are permanently enabled.
  • On Android devices, the LinX app must be granted the highest level of permissions, with Location access set to “Allow all the time.”

Xiaomi devices:

  • Some Xiaomi models may experience issues with data reception. If this occurs, try closing the app and restarting Bluetooth.
  • On certain Xiaomi models, an audible signal may sound when Bluetooth scanning is active, and the system may display battery usage notifications when opening the app.
  • If the connection fails, please try again.

iOS (version 14 or later)

  • If you are not receiving notifications from the app, make sure that system notifications are enabled for the LinX app.
  • If the connection fails, please try again.

Before purchasing a new smartphone or installing a new operating system version, we recommend checking LinX device compatibility. If needed, update your LinX app to ensure full compatibility with the latest operating system.

If your smart device is not compatible with the LinX mobile app, you can use the LinX receiver, which functions as an alternative to the mobile app.

If your smart device is not compatible with the LinX app, you may experience issues downloading or using the app properly. Before purchasing a new device or updating your operating system, always check compatibility with the LinX app.

If you discover compatibility issues after purchasing a device, please contact us—we will do our best to find a convenient and suitable solution.

CGM is a versatile device that can be used both short-term and long-term, depending on individual needs and health goals. For people without diabetes—such as those aiming to improve metabolic health, manage weight, or optimize performance—CGM can be used temporarily to understand how nutrition, physical activity, sleep, and stress affect blood glucose levels. Once these insights are applied, continuous use may no longer be necessary.

For individuals with type 1 or type 2 diabetes, CGM is most beneficial when used long-term on a daily basis, as continuous monitoring plays a key role in safe and effective glucose management.

The cost for a few months of CGM use is up to 200 euro, which is considered reasonable given the long-term benefits, improved health awareness, and better decision-making it enables.

CGM provides continuous, real-time glucose monitoring, offering far more insight than traditional finger-prick measurements, which only show single moments in time.

For people with diabetes, CGM supports safer glucose control, helps reduce the risk of hyperglycemia and hypoglycemia, and enables better treatment decisions.

For individuals focused on weight management, CGM helps identify blood sugar fluctuations that may lead to increased hunger, cravings, or low energy levels.

For athletes and fitness enthusiasts, CGM offers valuable feedback on how training intensity, recovery, and nutrition impact glucose levels and overall performance.

By delivering real-time feedback, CGM allows users to immediately adjust meals, physical activity, and daily habits, helping build sustainable, long-term health and performance strategies.

The easiest way to order a CGM device is through our website.

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Yes, CGM data can be shared with healthcare professionals, family members, or coaches via the mobile app. This is especially useful for people with diabetes who work closely with their doctor, as well as for athletes or individuals following structured health or training plans.

Before applying Your CGM

Ending sensor use and starting a new cycle

To end the current LinX sensor and start a new usage cycle, wait until the sensor reaches the end of its wear period.
If needed, the sensor can also be stopped and removed at any time before the end of its wear period.

Removing the sensor

Carefully peel off the adhesive patch from the skin to remove the sensor.

Applying a new sensor

Applying a new LinX sensor is done in the same way as the initial application, following the standard insertion instructions.

  1. Perform a finger-stick blood glucose test using a glucometer.

  2. Open the LinX app and tap “Fingerstick BG” in the bottom menu.

  3. Input fingerstick value to match the glucometer result and tap “Record”.

  4. Return to the home screen. An icon will appear on the glucose curve; tapping it will show the time and value of the saved measurement.

If the sensor has been used for at least 1 day and you believe its readings differ significantly from finger-stick results, manual calibration can be performed, provided glucose levels are stable.

To calibrate:

  • Tap “Fingerstick BG”

  • Input fingerstick value to match the glucometer result

  • Tap “Calibrate”

Calibration should not be performed within the first 24 hours after sensor application, and it is important that:

  • glucose levels are stable

  • at least 1 full day has passed since sensor insertion

This applies to people with diabetes as well as athletes and other users who rely on precise trend data.

  • Avoid very intense physical activity and continuous pressure, twisting, or compression at the sensor site (including during sleep), as this may cause sensor detachment or damage.

  • Users wearing the sensor on the arm should be especially careful when drying the skin with a towel and should avoid impacts or scratches (e.g. hitting door frames).

  • Choose an application site with sufficient subcutaneous fat to avoid inserting the sensor into muscle tissue.

  • The LinX sensor is water-resistant according to IPX7 standards. Showering and swimming are allowed, but water exposure should not exceed 30 minutes or 1 meter in depth.

  • For active users and athletes, using an additional adhesive patch is recommended to improve sensor retention.

  • Do not use the product in strong magnetic fields. Before an MRI examination, remove the sensor and do not bring it into the procedure room.

CGM is a versatile device that can be used both short-term and long-term, depending on individual needs and health goals. For people without diabetes—such as those aiming to improve metabolic health, manage weight, or optimize performance—CGM can be used temporarily to understand how nutrition, physical activity, sleep, and stress affect blood glucose levels. Once these insights are applied, continuous use may no longer be necessary.

For individuals with type 1 or type 2 diabetes, CGM is most beneficial when used long-term on a daily basis, as continuous monitoring plays a key role in safe and effective glucose management.

The cost for a few months of CGM use is up to 200 euro, which is considered reasonable given the long-term benefits, improved health awareness, and better decision-making it enables.

Getting started with CGM

To create a LinX user account, follow these steps:

  1. Download the LinX mobile app.

  2. Select “Create account.”

  3. Enter the required information.

After registration, you can connect the app to your LinX transmitter and begin using the CGM system.

Important: The app must be set up before applying the sensor.

To set up the LinX app:

  1. Download the LinX app to your smartphone.

  2. Open the app after installation.

  3. Enter the required information.

  4. Follow the on-screen instructions to complete the setup process.

The LinX CGM sensor should be applied to the back of the upper arm.

Important guidelines:

  • Ensure there is enough subcutaneous fat at the selected site; avoid inserting the sensor into muscle or areas with minimal fat.

  • Do not place the sensor on scars, stretch marks, moles, uneven skin, or insulin injection sites.

  • Before application, disinfect the area with an alcohol wipe.

  • Avoid using moisturizing creams or lotions shortly before sensor application.

Before application:

  • Download the LinX app and create a user account.

  • Sensor application is recommended in the morning on an empty stomach, when glucose levels tend to be more stable.

  • After sensor application, allow 60 minutes for the sensor to warm up and calibrate. During this time, avoid eating or drinking. Afterward, you may resume normal meals and hydration.

Skin preparation

  • Clean the application site with a disinfectant wipe and allow it to dry completely.

  • Do not apply creams, lotions, or oils—the skin must be clean and dry.

  • When dressing, be cautious to avoid accidentally dislodging the sensor.

Sensor application process

  1. Ensure all placement guidelines have been followed.

  2. Open the applicator by turning the cap located at the bottom of the applicator.

  3. Press the applicator firmly against the selected application site.

  4. While maintaining pressure against the skin, press the white button firmly.

  5. You will hear a click indicating that the sensor has been inserted. Keep the applicator pressed against the skin for 10 seconds to ensure optimal adhesion, then remove the applicator.

  6. Check that the sensor is securely attached and smooth down the edges of the adhesive patch.

  7. Connect the sensor to the LinX mobile app by opening the app and following the on-screen pairing instructions.

To improve sensor adhesion and reduce the risk of accidental removal or impact—especially during sports or active daily routines—we recommend applying an additional protective patch over the sensor (available separately).

The LinX app displays your current glucose level and trend direction directly on the home screen. To view this information, simply open the app at any time.

This real-time overview helps users quickly understand how glucose levels are changing throughout the day—whether for diabetes management, energy optimization, or performance tracking.

Notifications can be enabled during the initial app setup by following the on-screen instructions.

If you want to enable or adjust notifications after the initial setup, go to Settings → Notifications within the app.

Important:
LinX app notifications do not override your phone’s system settings. If your phone is set to silent or do-not-disturb mode, notifications will not play sound or vibration.

To avoid missing important alerts—especially for low or high glucose levels—please check your phone’s notification and sound settings.

The transmitter code is a 6-digit serial number printed on the back of the transmitter packaging.

This code is required when pairing a new transmitter with the LinX app for the first time. It allows the transmitter to connect to the app and begin sending your glucose data.

The code can be entered manually or scanned.

Important:
The serial number contains the digit 0 (zero) only—not the letter “O.”

If bleeding occurs at the sensor application site:

  1. Apply gentle pressure to the area for a few minutes until the bleeding stops.

  2. Once the bleeding has stopped, continue using the sensor as normal.

  3. Monitor your glucose readings in the LinX app during use.

If CGM readings differ significantly from finger-stick blood glucose results, it may be advisable to replace the sensor.

If bleeding does not stop after a few minutes, remove the sensor. If the user is not taking blood-thinning medications, a new sensor may be applied at a different site.

Why does bleeding occur at the sensor application site?

During sensor insertion, the applicator needle passes through the upper layers of the skin to place the sensor into the interstitial fluid. Small blood vessels are present in these layers, and bleeding may occur if one of them is punctured.

Bleeding may also occur if:

  • the sensor is inserted too deeply,

  • the sensor is placed into muscle tissue,

  • excessive force is applied during insertion.

To reduce the risk of bleeding or discomfort, apply the sensor gently and choose an area with sufficient subcutaneous fat. Inserting the sensor into muscle may cause pain, bleeding, or sensor malfunction.

If you believe medical attention is required, consult a healthcare professional.

Troubleshooting

A message “Replace sensor” is usually displayed.

Possible reasons:

  • The chosen application site is not suitable.

    • On the abdomen, avoid the midline, scars, waistband area, stretch marks, and insulin injection sites.

    • Apply the sensor at least 5 cm away from the navel.

    • On the arm, apply to the back of the upper arm, where more fatty tissue is present. Avoid the outer arm muscles.

  • Incorrect sensor insertion technique.

    • The applicator must be pressed firmly against the skin.

    • Gently push the abdomen outward during insertion.

    • Do not pull the abdomen in or bend forward during insertion.

    • Keep your finger firmly on the button when inserting the sensor to ensure proper activation.

Transport

In rare cases, the sensor may be damaged during transport, and the needle may not be centered correctly.

1. No graph after warm-up – “Sensor stabilization”

Possible cause: minor subcutaneous bleeding affecting early data.
Please wait patiently until the graph appears. This will not take longer than 4 hours.

2. “Sensor stabilization” during use

Please wait until data becomes available again. This usually takes a short time and may occur during internal signal adjustment. Follow the app’s on-screen instructions.

If “Sensor error” appears a few days after insertion, the most common causes are:

  • unsuitable application site (too little fatty tissue)

  • incorrect insertion technique

  • physical damage to the sensor (e.g. impact)

If the error appears later during use, it is usually caused by reduced adhesive contact or surface damage to the sensor, affecting skin contact.

Issue

Glucose readings stop updating, or data syncing/calibration fails (commonly observed on some Xiaomi devices).

Solution

  1. Fully close the app by swiping it away 2–3 times.

  2. Turn Bluetooth off, then back on.

  3. Reopen the app.

  4. If the issue persists, restart your phone.

Possible reasons:

  • Pressure on the sensor during sleep, which may cause falsely low readings.

  • Sudden spikes may occur during temporary signal instability.

  • If the glucose curve was stable and then suddenly jumps, wait and observe — the curve usually normalizes on its own.

This information is relevant for both people with diabetes and athletes monitoring rapid metabolic changes.

If an error occurs:

  1. Fully close the app.

  2. Turn Bluetooth off and back on.

  3. Reopen the app.

If the error continues, follow the in-app instructions related to the currently used sensor.

CGM devices are not suitable for people who:

  • suffer from alcoholism, drug abuse, or severe mental disorders

  • are unconscious

  • cannot understand or learn how to use the device

  • have severe hearing or vision impairment

  • have severe swelling or serious circulatory problems

  • are allergic to the sensor adhesive

  • are too young or too old to care for themselves without a caregiver

If your glucose levels fluctuate significantly or you experience high or low glucose levels that you cannot manage on your own, seek medical assistance from a hospital or healthcare professional.

If you experience problems using the product or if it does not function properly, please contact your local distributor or supplier.