The sensor has a diameter of 1.31 inches (33.3 mm) without the adhesive.The part of the sensor that sits below the skin is approximately 0.24 inches (6 mm).

Apply the sensor only on the back of your upper arm. See the package insert for a picture of the correct insertion site.

Find out how to apply your SmartGuide sensor in the CGM Learning Centre.

Yes, the sensor is protected against the effects of temporary immersion in water at a depth of 1 meter (3.28 feet) for up to 60 minutes (it has a IP28W rating).

No, the sensor must be removed before entering medical treatment areas with high-powered medical electric equipment, for example magnetic resonance imaging (MRI), computed tomography (CT), X-ray, radiotherapy, or diathermia.

However, you can wear the sensor in the full-body scanners used at the airport.

The sensor automatically stops working and stops sending data after a wear time of 14 days. About 24 hours before the sensor expires, mySugr Glucose Insights notifies you that the sensor expires soon and that you should apply a new one. You receive an additional notification 2 hours before sensor expiration.

Start peeling off the adhesive pad on the flattened side of the sensor.
Inspect the back of the sensor: Make sure that the sensing element of the sensor has been completely removed from the insertion site after removing it. Check the insertion site by using your finger or check it visually. If the sensing element remained in your skin or the application site feels unusual (for example, painful, swollen, or red) contact your healthcare professional.

An unusual feeling at the application site can still occur a few days after removal of your sensor. In this case, consult your healthcare professional.

For more information, please check How to remove and dispose the sensor.

No, you cannot reuse the sensor and adhesive pad. Every sensor and adhesive pad can be used only once.

Discard the sensor as potentially infectious material according to local regulations. For information on how to discard used components correctly, contact your local council or authority.

Other components of the pack can be discarded in domestic waste. A damaged sensor applicator housing or an exposed sensor needle can cause injury. Discard sharp objects according to local regulations. Make sure that sharp objects don't cause injury to you and others. For more information, please check How to remove and dispose the sensor

Refer to 'How to pair Accu-Chek SmartGuide sensor and app'.

To check that the CGM sensor delivers correct results, check your blood glucose with an accurate blood glucose meter at a time when your glucose does not change rapidly. To ensure that the sensor is working accurately, calibrate the sensor only in times of stable glucose levels and wash your hands before taking the blood sample from your fingertip.

Don’t ignore symptoms of low or high glucose, and don’t change your therapy without talking to your healthcare professional. If your CGM value doesn’t match how you feel:

• Test your blood sugar by performing a finger-prick check with a blood glucose meter.
• Perform a second finger-prick check with your blood glucose meter to rule out an incorrect test result.
• If test results from your blood glucose meter repeatedly don’t match how you feel, consult your healthcare professional.

Yes, the Accu-Chek SmartGuide sensor has an initial calibration routine, consisting of 2 steps.

The calibration routine consists of two steps:

After a warm-up time of 1 hour, the sensor is in Trend Mode, and sends CGM values to the app every 5 minutes. Don't use these initial CGM values to make therapy decisions, such as insulin dosing. 12 hours after insertion of the sensor, the app prompts you to calibrate.

Step 1: Check your blood glucose and enter the glucose value into the app. The sensor goes into Therapy Mode. CGM values can now be used to make therapy decisions, such as insulin dosing.

Step 2: 30 minutes to 3 hours later, when prompted, test your blood glucose again and enter the glucose value into the app. This is to confirm the first measurement. Note: If step 2 is missed, the sensor returns to Trend Mode.

The calibration routine is completed for the sensor.

To calibrate your sensor:

1. Check your blood glucose with your blood glucose meter, according to the manufacturer's instructions.
2. Tap Calibrate Now on your Home screen.
3. Enter the glucose value from your blood glucose meter on the Calibrate CGM sensor screen. The glucose value should be entered no later than 3 minutes after performing the test.
4. Confirm that you understand that you can’t edit or delete calibration values once they are confirmed and tap I understand.
5. Check that you entered the same glucose value into the app that was displayed on your blood glucose meter and tap Confirm. If you accidentally entered an incorrect value, tap Keep editing and enter the correct value.

The glucose measurements of the sensor are more accurate if you calibrate at a point in time when your blood sugar level is relatively stable. Do not calibrate shortly after a meal, after insulin administration, or after physical activity, and avoid environments with very hot or very cold temperatures, or rapidly changing temperatures. If you accidentally entered an incorrect value, tap Cancel and enter the correct value.

Your sensor is calibrated.

The sensor requires calibration to provide you with the most accurate readings possible:

• An uncalibrated sensor will be in Trend Mode. You can see CGM values but should not use them for therapy decisions.
• A calibrated sensor will be in Therapy Mode. You can use the confirmed values to make decisions (such as insulin dosing).

The sensor mode appears under the CGM value on the Home screen.

There are 2 modes of CGM values: Trend Mode and Therapy Mode.

The mode the sensor is currently in is indicated directly below the CGM value on the Home screen.

When the sensor is in Trend Mode the following applies:

• CGM values should not be used to make therapy decisions, such as insulin dosing.
• CGM values can be used only to see trends and as a general reference.
• To make therapy decisions, such as insulin dosing, test your blood sugar with your blood glucose meter.

When the sensor is in Therapy Mode the following applies:

• CGM values can be used to make therapy decisions, such as insulin dosing.

The overall MARD (Mean Absolute Relative Deviation) of the Accu-Chek SmartGuide sensor is 9.2%.

For more information see the chapter Technical Data in the Accu-Chek SmartGuide device User's Manual.