Guide to Using Dexcom G7: What it is, How to Use, and FAQs
The Dexcom G7 is a continuous glucose monitor (CGM) that allows you to track your blood sugar levels continuously.
Continuous glucose monitoring (CGM) has a number of benefits over a traditional glucometer, and it can lead to better blood sugar control. Many people with diabetes prefer using a CGM, because it offers convenience and comfort.
In February 2023, the Dexcom G6 CGM system became available in Singapore. We were excited when this was announced, because it means that our patients now have access to another great option for monitoring their sugar levels. The other CGM available here is the FreeStyle Libre, which is also excellent. However, it’s best if patients have options and can choose what works best for them.
In 2025, Dexcom G7 became available in Singapore. Each Dexcom G7 sensor lasts for 10 days and can be worn either on your upper arm, abdomen or upper buttocks. Notably, the Dexcom G7 is 60% smaller than the G6, and does not require a separate transmitter like the G6, making it a more convenient option for users.
However, if you’re already keen on exploring Dexcom G7, or have recently begun using the system, here’s a helpful guide to help you get the most out of your CGM.
The Dexcom G7 CGM consists of the following:
Water-resistant sensor: Two hours after insertion beneath the skin, the sensor begins continuously measuring blood sugar levels.
Dexcom CLARITY: Dexcom CLARITY is an app and a web-based software accessible on a computer that provides information about current and historical glucose values.
How do I apply the Dexcom G7 sensor?
For most people, one of the most attractive features of using a CGM is that you don’t need to perform fingersticks multiple times every day. Once you apply the sensor, it remains in place for a period of time. It’s water-resistant, allowing you to wear it while showering and even swimming. To apply the sensor:
Select your sensor site. This must be different from your previous sensor site. If you’re using an insulin pump, the sensor must also be at least three inches away. The upper arms and the abdomen are the usual places for placing the sensor. Don’t apply it directly over any scars, irritated skin, tattoos, or thick body hair.
Use rubbing alcohol to cleanse the skin at your chosen sensor site. Clean the transmitter as well, and let it dry while you apply the sensor.
Remove the two labels from the sensor applicator. The surface will now be sticky.
Place the sticky side of the sensor applicator against your skin at the insertion site.
There is a safety guard over the orange button on the sensor. Fold and break off this safety guard, and press the orange button to deploy the sensor beneath your skin.
Insert the transmitter into the slot on the sensor.
Press firmly around the entire edge of the sensor, to ensure that it has adhered well.
Your sensor will remain attached during all of your activities for the next ten days. If you’re worried about losing your sensor, you can apply a patch, bandage, or clear barrier over it.
The sensor will need to be changed every 10 days. You can change it more often if you’d like, but you shouldn’t go longer than 10 days in between new sensors. You will receive an alert when it’s time to change your sensor. The transmitter is good for 90 days, and it can be reused when you apply a new sensor.
How do I check my blood glucose with Dexcom G6?
Dexcom G7 works with a variety of smart devices, including both iOS and Android smartphones as well as Apple and Wear smartwatches. You will need to download the Dexcom app onto your device. If you don’t have a smart device, and don’t want to get one, you can also purchase a standalone Dexcom receiver to connect to your sensor.
One of the best features of Dexcom G6 is that it doesn’t require any scanning to download the data from your sensor to your phone. Your sensor will automatically send a reading of your blood sugar to your phone every five minutes. Simply open the app to see a record of your readings.
The Dexcom app will alert you whenever your blood glucose goes too high or too low. You can set the specific blood sugar numbers for these alerts in the app. This ensures that you don’t miss an important change in your blood sugar.
The app doesn’t necessarily wait to alert you until your blood sugar is in the critical range. For example, if the trend in your blood sugar indicates that you’re predicted to go too low within 20 minutes, the app will let you know. This allows you to take action and avoid a dangerous event.
You can also choose to share the data from your CGM with someone else. This allows a family member or close friend to help keep an eye on your blood sugar, providing an extra level of safety. Sharing your CGM data with someone else is entirely optional, but some of our patients like the extra peace of mind they get from knowing that someone else is watching out for dangerous changes in their blood sugar. You can designate up to ten people to receive your CGM data, although most of our patients choose just one or two others.
It’s important to note that any CGM, including the Dexcom G7, is not actually measuring the level of sugar in your blood. Instead, it’s measuring the level in your interstitial fluid, which is the fluid between the cells in your tissues. The level of sugar in this fluid is highly correlated with the level in your blood, and most of the time, measuring blood sugar in this way works well. However, it does take a few minutes for changes in your blood sugar to be reflected in your interstitial fluid. This may become relevant if you experience large and quick changes in blood sugar.
This video demonstrates how to apply the Dexcom G7 sensor.
CGM Systems Available in Singapore
Dexcom G7, BUZUD 2.0 and Abbott FreeStyle Libre are some widely used fingerstick-less CGM systems currently available in Singapore.
Dexcom G7 is now available at the NOVI Shop. 👇
This publication does not constitute an advertisement, and is intended solely for educational purposes. Please seek professional medical advice as to whether a health product would be appropriate for you.