FAQ
Frequently Asked Questions
Quick answers to the questions we hear most about the LinX Continuous Glucose Monitoring (CGM) sensor. Can't find what you need? Contact us and we'll help.
Jump to: The basics · Applying the sensor · Daily wear · Readings & accuracy · App & alerts · Troubleshooting · Safety · Orders & support
This page is general product information and does not replace the Instructions for Use supplied with your sensor or the advice of your doctor.
The basics
What is the LinX CGM and how does it work?
LinX is a small sensor worn on the skin. A thin filament under the skin measures glucose in the interstitial fluid and sends the readings to the LinX app on your phone over Bluetooth, so you can see your glucose level and trend without routine fingersticks.
How long does one sensor last?
Each sensor works for 15 days. After that it stops automatically and must be replaced with a new one.
How big is the sensor?
It is 22 mm in diameter, 4.2 mm thick and weighs about 2.2 g, roughly the size of a coin.
How often are readings updated?
The app shows a new glucose reading every minute, along with a trend arrow and graph.
What glucose range can it measure?
36–450 mg/dL (2.0–25.0 mmol/L).
Do I still need fingerstick tests?
Not for routine checks. Do a fingerstick test if your symptoms don't match the sensor reading, if a reading looks wrong to you, or if your doctor advises it.
Does the sensor need calibration?
No. It is calibrated at the factory. Optional calibration is available in the app if the sensor and your blood glucose meter keep differing by more than 20%. See Readings & accuracy for when and how.
Who is the LinX CGM for?
The manufacturer's Instructions for Use indicate the system for adults aged 18 and over with diabetes. For children and adolescents, speak to your doctor first; a caregiver should always supervise use.
Applying the sensor
Where should I apply the sensor?
On the back of the upper arm. Choose a spot at least 2.5 cm away from any insulin injection or infusion site, and avoid scars, moles, tattoos, stretch marks, lumps and areas with a lot of hair.
How should I prepare my skin?
Wash the area with soap and water, dry it completely, then wipe it with an alcohol pad and let it air-dry. Don't use lotion, cream or body wash on the area beforehand, as oily residue weakens the adhesive.
How do I apply the sensor?
Remove the cover from the applicator, place it flat on the prepared skin, push straight down and press the button on top. Hold for about 3 seconds, lift the applicator away, and smooth down the edges of the adhesive patch.
How do I pair the sensor with my phone?
Open the LinX app, tap Pair and choose the serial number (SN) that matches the one printed on your sensor package. Keep Bluetooth switched on.
How long until I see my first reading?
The sensor needs a warm-up of about 1 hour after pairing. Readings start automatically after that.
Does applying it hurt?
Most people feel only a brief pinch. If you have pain or bleeding that doesn't settle, remove the sensor and contact us.
Daily wear
Is the sensor waterproof? Can I shower or swim with it?
Yes. The sensor is rated IP68 and can be submerged in up to 2 metres of water for up to 60 minutes. Showering and swimming are fine; very long baths or swims can loosen the adhesive.
Can I exercise while wearing it?
Yes. Take care not to knock or rub the sensor, and avoid squeezing or twisting the skin around it. Heavy sweating can loosen the adhesive, so an overpatch helps during sport.
How do I stop the sensor from peeling off?
Good skin preparation matters most: clean, dry, oil-free skin. Avoid catching the sensor on door frames or clothing, pat it dry gently after a shower instead of rubbing, and use an overpatch for extra hold.
Can I travel or fly with it?
Yes. Carry spare sensors in your hand luggage and tell security staff you are wearing a medical device. When you cross time zones the graph may show a gap or overlap; this is normal, because each reading keeps the local time it was measured.
How should I store unused sensors?
Keep them in the original packaging at 2–25°C, away from direct sunlight. Do not freeze them, and check the expiry date on the box before use.
Readings & accuracy
Why is my sensor reading different from my fingerstick meter?
The sensor measures glucose in interstitial fluid, while a meter measures blood. When glucose is stable the two are close. When glucose is rising or falling quickly, for example after a meal, insulin or exercise, the sensor can lag 5–15 minutes behind your meter.
Why do readings seem low on the first day or two?
The skin reacts slightly to a new sensor, which can make readings a little lower than your actual blood glucose. This usually settles within 48–72 hours.
When should I calibrate?
Only if the sensor and meter differ by more than 20%, and the difference is still there when you re-test after 2 hours. Calibrate when your trend arrow has been flat for at least 15 minutes, and enter the meter result within 5 minutes of the test.
When should I not calibrate?
During the first 24 hours of a new sensor, within 6 hours of a previous calibration, within 15 minutes of eating carbohydrates or taking insulin, or while your glucose is changing quickly. The app may reject a calibration it considers unsuitable.
Do paracetamol or vitamin C affect the readings?
Normal doses of paracetamol (acetaminophen) and vitamin C (ascorbic acid) do not interfere. Very high uric acid levels may affect readings; ask your doctor if this applies to you.
App & alerts
Which phones are supported?
The LinX app is free on the App Store and Google Play. It needs iOS 14 or later, or Android 10 or later.
What alerts does the system have?
Six alerts: high glucose, low glucose, urgent low, rapid rise, rapid fall and signal lost. You can set your own high and low thresholds; by default the app treats above 180 mg/dL (10 mmol/L) as high and below 70 mg/dL (3.9 mmol/L) as low.
Why am I not getting alerts?
Alerts only work when the alert function is switched on, the sensor is connected, and the app is running in the background. Don't force-close the app, and allow all the permissions it asks for.
Can I share my readings with family or my doctor?
Yes. Use Share/Follow in the app's personal settings to invite followers, who see your readings in their own LinX app. You can also export a glucose (AGP) report from the Trend screen to show your doctor.
Can I use one sensor on two phones?
No. A sensor pairs with one account at a time, and an account can be logged in on one phone at a time. To move to another phone, unpair the sensor in Settings > Pairing first.
Is my data secure?
Your personal and glucose data are encrypted and stored securely. See our Privacy Policy for details.
Troubleshooting
The app shows no readings or says the signal is lost. What should I do?
Keep your phone within 2 metres of the sensor with nothing blocking it. Then try, in order: switch Bluetooth off and on, close and reopen the app, restart your phone. Readings stored in the sensor while it was disconnected are filled in once the connection returns.
The sensor won't pair.
Check that the SN you selected matches the package. Switch Bluetooth off and on, remove the sensor from your phone's Bluetooth device list, and pair again. If the app says the SN is already in use, unpair it from the previous phone or account first.
The app shows a sensor error.
Restart the app and Bluetooth. An error can appear if the sensor was knocked or the patch has come loose. If the error lasts more than 4 hours, replace the sensor and contact us.
My sensor fell off or stopped before 15 days.
A sensor that has come off cannot be reapplied. Contact us with your order number and the sensor's serial number and we will look into it under our Warranty Policy.
Safety
Can I wear the sensor during an MRI, CT scan or X-ray?
No. Remove the sensor before an MRI or CT scan and before diathermy (high-frequency heat) treatment; a removed sensor cannot be reapplied. For other scans or procedures, ask your doctor or the imaging staff beforehand.
Is there anyone who should not use the sensor?
Check with your doctor before use if you have an implanted pacemaker, a bleeding disorder or take blood-thinning medication, a known allergy to medical adhesives, or severe swelling or poor circulation at the application site. The full list is in the Instructions for Use.
Does the sensor contain latex?
No. The adhesive patch and overpatch are latex-free medical tape. If you develop redness, itching or a rash that doesn't settle, remove the sensor and speak to your doctor.
How do I dispose of a used sensor and applicator?
The used applicator contains a needle, and the sensor contains a small battery and has been in contact with body fluid. Dispose of both according to local rules for medical sharps and electronic waste. Never burn a sensor.
Orders & support
Which packs are available?
Three packs: 2 sensors (about 1 month), 4 sensors (about 2 months) and 6 sensors (about 3 months).
How long does delivery take?
Orders are processed within 1–2 business days and usually arrive 3–5 business days after that. You will receive tracking details by email when your order ships. See our Shipping Policy.
Can I cancel or return my order?
You can cancel within 24 hours of ordering, as long as the order has not shipped. Unopened sensors in their original packaging can be returned under our Cancellation and Returns policy.
How do I contact support?
Email contact@linx-sensor.com or call +20 121 182 1696. Please include your order number and, for sensor problems, the serial number on the package.
