The FreeStyle Libre sensor is placed exclusively on the back of the arm, in the fleshy area between the shoulder and the elbow, as indicated by the manufacturer. If you are a new user or are thinking about changing, in this article we explain where to put the FreeStyle Libre sensor, that small glucose meter without pricks that so many people with diabetes use every day. We also tell you what it is, how to read its data correctly and how to protect it so that it lasts without problems.
What is the Freestyle Libre sensor?
The FreeStyle Libre sensor is a patch for the arm that measures glucose levels in the interstitial fluid (the one that surrounds the cells, not in the blood). It is approximately the size of a two euro coin and is placed on the skin with the help of an applicator. Its great advantage is that you don't need to prick your fingers to get results: just bring the reader or a compatible mobile phone close to the sensor to see the measurement instantly.
It is convenient to distinguish the models, because not all of them last the same. The FreeStyle Libre 2 and the FreeStyle Libre 3 have a useful life of up to 14 days, while the FreeStyle Libre 3 Plus lasts up to 15 days. During that time, the sensor continuously stores glucose data, which allows you to detect patterns, anticipate drops and maintain better overall control. You can consult more details about How long does a glucose sensor last? Depending on the model you use.
Where is the Freestyle Libre glucose sensor placed?
The only approved place to place the FreeStyle Libre sensor is the Back of the arm, specifically the fleshy area between the shoulder and the elbow, avoiding the central triceps. It is the only location validated by the manufacturer for all models, including the FreeStyle Libre 3 Plus. Why precisely there?
- It is an area with good circulation of interstitial fluid.
- It has little muscle movement compared to other parts of the body.
- It is accessible for both right-handed and left-handed people.
- Reduces the risk of the sensor detaching due to rubbing or pressure.
Although sometimes it is heard that some users place the sensor in other parts of the body, such as the abdomen or thighs, these areas are not validated by the manufacturer and can alter the accuracy of the readings. If you are looking for reliability in controlling your blood sugar, the back of the arm is the recommended option.
How to install the sensor step by step
Placing the FreeStyle Libre glucose sensor is a simple process, but it is advisable to do it carefully to ensure good adhesion throughout use:
- Wash and dry well the area of the arm where you will place the sensor.
- If you wish, gently shave the area to avoid hair interfering with adhesion.
- Use the alcohol-containing wipe included in the kit to disinfect the skin and make sure it is completely dry.
- Mount the applicator according to the manufacturer's instructions.
- Apply the sensor to the arm with a firm and direct movement.
- Check that it is well adhered, without pressing too hard.
- To keep it in place and last longer, use protectors such as Glucody patches, which help fix the sensor even if you sweat, swim or exercise.
How to configure a new sensor in the glucose meter
After applying the sensor, it is necessary to activate it from the official FreeStyle Libre reader or from the mobile application:
- Open the FreeStyle Libre application on your smartphone and select the option "Start new sensor" in the main menu.
- Bring the reader or smartphone close to the sensor, hold the position until the app confirms the reading (sound or vibration).
- Wait a few seconds until the device is detected. The system will display a message saying "Sensor activated correctly".
- You will have to wait 60 minutes for the sensor to stabilize and begin sending accurate glucose readings to your phone. During that first hour, the sensor is being calibrated, so no data is obtained. This is completely normal.
- After that time, you will be able to start scanning your levels.
How to measure glucose with the Freestyle Libre sensor
Once the non-prick glucose meter is activated, taking the measurement reading is as easy as bringing the reader close to the sensor. Do it as many times as you want, but remember that the device only stores automatic data every 15 minutes.
You can use the specific reader or the official app, compatible with many Android and iOS mobile phones, the system shows:
- Current glucose reading.
- Graph of the last 8 hours.
- Trend (up, down or stable).
Meaning of the arrows in the glucose reading
In the reading, next to the glucose number, there is an arrow that indicates the direction in which your level is moving. These arrows are a powerful tool to anticipate:
- 🔼 Upward arrow indicates that glucose is rising rapidly.
- ➡️ Horizontal arrow, that the glucose is stable.
- 🔽 Downward arrow, indicates that glucose is decreasing.
For example, if your blood sugar is 90 mg/dL and the arrow points downwards, it may be a good time for a small snack, depending on your diet plan.
How to keep the sensor protected?
The FreeStyle Libre sensor is water-resistant up to 1 meter deep for up to 30 minutes, so you can shower, swim or exercise without removing it. Even so, friction, sweat and temperature changes can cause it to detach prematurely, especially if you exercise frequently or live in a hot climate.
Protecting it with a specific patch reduces that risk and extends its duration. Glucody's protective patches are designed to increase adhesion, protect against accidental knocks or hooks, allow the skin to breathe and stay in contact with the water without lifting. You can see them in our collection of Glucose sensor patches. If you want more tricks, in this guide we explain them to you How to protect the FreeStyle Libre sensor In everyday life.
Frequently asked questions about where to put the FreeStyle Libre sensor
Where is the FreeStyle Libre sensor placed?
The FreeStyle Libre sensor is placed on the back of the arm, in the fleshy area between the shoulder and the elbow. It is the only location approved by the manufacturer for all models, and placing it in other areas can alter the accuracy of the readings.
Can the FreeStyle Libre sensor be placed elsewhere on the body?
Not recommended. Although some users place it on the abdomen or thighs, those areas are not validated by the manufacturer and may affect the reliability of glucose data. The only approved location is the back of the arm.
How long does the FreeStyle Libre sensor last?
The FreeStyle Libre 2 and the FreeStyle Libre 3 last up to 14 days, while the FreeStyle Libre 3 Plus lasts up to 15 days. After that time, the sensor stops measuring and you have to replace it with a new one.
Can the FreeStyle Libre sensor be wet?
Yes. The sensor is water resistant up to 1 meter of depth for a maximum of 30 minutes, so you can shower or swim with it. To prevent it from coming off with water or sweat, it is recommended to use a protective patch.
How long should you wait after placing the sensor?
After applying the sensor, you must wait 60 minutes for it to stabilize before the first reading. During that hour, the sensor is calibrating and does not provide data, which is completely normal.
Now that you know exactly where to put the FreeStyle Libre sensor and how to use it correctly, it will be easier for you to take advantage of all its advantages. At Glucody you will find durable, comfortable and safe patches adapted to your lifestyle to keep this tool that improves your quality of life protected. If you have any doubts, write to us and we will help you choose the product that best suits you.
