Using a continuous 24-hour glucose sensor is a valuable tool for people with diabetes who want to closely monitor their blood sugar levels. Here's how to use it:

1. Prepare the sensor: First, make sure the sensor is not expired and that you have all the necessary supplies. Clean the area on your body where you will be inserting the sensor with soap and water. Then, use an alcohol swab to disinfect the area and let it dry.

2. Insert the sensor: The sensor will come with an insertion device that you use to insert the sensor under the skin. The device is often placed on the abdomen, or thigh, but the side or back of your upper is now preferred. Follow the instructions provided with your sensor to insert it correctly.

3. On some of the older Dexcom sensors you will also need to attach a transmitter to the sensor. This is a device that will communicate with your glucose meter or smartphone to display your glucose levels. The transmitter is usually attached to the sensor with an adhesive patch.

4. Turn on the receiver: If you have a separate receiver, turn it on and follow the instructions to pair it with the transmitter. If you are using a smartphone app to view your glucose levels, follow the instructions provided to connect the app with the transmitter.

5. Check your glucose levels: Once the sensor is inserted and the transmitter is attached, your glucose levels will be continuously monitored and transmitted to the receiver or app. You can check your glucose levels anytime by looking at the receiver or app.

6. Replace the sensor: Most sensors need to be replaced every 7 to 14 days, depending on the model. Transmitters on older Dexcom models are changed at three month intervals. Follow the instructions provided with your sensor to remove the old sensor and insert a new one.

While the newer continuous glucose sensors have become quite accurate and reliable, if  if you suspect a problem with your sensor or if your glucose level from the sensor does not make sense, you should test your blood glucose using the fingerstick method (which is described in a separate article on this website, “Obtaining a Fingerstick Blood Glucose Level”),  to confirm the accuracy of the sensor and to make sure your glucose level is within a safe or target range. Additionally, consult with your healthcare provider about how to interpret your continuous glucose sensor data and adjust your diabetes management plan accordingly.