11 Tips for Getting the Best Out of Your Child’s CGM
You’ve got the sensor. Now let’s make it work as well as possible- more accuracy, fewer errors and smoother days (and nights). These tips are gold, especially if you’re managing a wiggly toddler, a sporty schoolchild or a moody teenager.
1. Time Sensor Insertions for Stability
Why it matters: CGMs are most prone to inaccuracies in the first few hours after insertion- especially if blood sugars are rising or falling rapidly.
Tip: Aim to insert a new sensor during a period of blood glucose stability, ideally:
2 hours after a meal (when insulin is active but levels are steady)
Not immediately after exercise
In the early evening, so the adhesive sets overnight and you wake up to more accurate data
Avoid inserting during highs, lows or post-snack spikes- it gives the sensor a better chance to settle in cleanly.
2. Keep Your Child Well-Hydrated
Why it matters: Dehydration affects the fluid layer where the CGM reads glucose, which can cause wonky readings
Tip: Encourage water intake, especially in the hot days, winter when we can drink less, illness or heavy activity
3. Warm the Sensor Before Insertion
Why it matters: A cold sensor can be uncomfortable and may not initialise properly
Tip: Let the sensor come to room temperature for at least 30 minutes before use
4. Use Sensor Friendly Insertion Times
Why it matters: Undisturbed settling time = better performance
Tip: Apply early evening (make sure you allow for the CGM to finish warm-up before bedtime) or during a calm part of the day. Avoid mealtimes, school mornings or just before sports.
5. Skin Prep is Key
Why it matters: Proper prep = better stick and fewer rashes
Tip: Clean with an alcohol wipe, let it dry fully. Use a Barrier wipe, spray or underpatch if your child has sensitive skin.
6. Keep Devices in Range
Why it matters: Bluetooth loss = data gaps
Tip: Keep phones or receivers within 6-10 feet (2-3 meters) of your child when possible especially at night
7. Patch It Up
Why it matters: Movement and sweat loosen adhesives
Tip: Use overpatches, especially before PE, swimming or warm weather. Consider applying after-school or on quieter days.
8. Track and Rotate Sites
Why it matters: Overuse of the same spot can cause scarring or inaccurate readings
Tip: Rotate CGM placement on arms, legs, tummy or upper bum- note where and when you last inserted
9. Mind the Meds
Why it matters: Some sensors (older models) are sensitive to paracetamol
Tip: Newer models (like Libre 2/3, Dexcom G6/7) are fine, but always double-check. During fever or pain relief finger prick if in doubt.
10. Adjust Alarm Settings Thoughtfully
Why it matters: Too many alarms can lead to stress or ignoring real issues
Tip: Set thoughtful thresholds- especially overnight. Teens may need looser thresholds than toddlers to preserve sleep and sanity.
11. Keep the Packaging
One of the simplest but most important things you can do is to keep the CGM sensor packaging and applicator until the sensor’s wear period is complete.
Always write the date and time of insertion directly on the box or applicator. If a sensor fails, gives incorrect readings, data issues on your phone cause the app to shut down losing sensor information or a skin reaction causes sensor failure- manufacturers often ask for details like the serial number, lot number and insertion date before issuing a replacement.
Having the packaging on hand can make the call or email submission quicker, smoother and far more likely to result in a hassle free replacement- especially when you’re already managing a stressed child and distrupted routine.
Pop it in a labelled zip-lock bag or a drawer near your diabetes supplies- future you will be grateful!
