FREE SHIPPING for orders over $120
Need help with CGM patches? This FAQ answers common questions about continuous glucose monitors (CGMs), CGM sensor patches (also called overpatches), wear time, waterproofing, skin sensitivity, application, removal, and troubleshooting. We’ve also included general CGM questions to help you understand how CGMs work and how to get the most out of your sensor.
Quick note: This page is general information only and isn’t medical advice. Always follow your CGM manufacturer’s instructions and speak with your healthcare professional for personalised guidance.
A continuous glucose monitor (CGM) is a wearable device that tracks glucose levels throughout the day and night. CGMs typically include a small sensor worn on the body and a transmitter (or integrated sensor) that sends readings to a phone app or receiver. CGMs help many people spot patterns, understand trends, and manage glucose more confidently.
A CGM sensor measures glucose in interstitial fluid (the fluid around your cells). The sensor sends readings regularly (often every few minutes) to an app/receiver, where you can see:
Finger prick tests measure blood glucose at a single point in time. CGMs estimate glucose from interstitial fluid and provide a continuous stream of data and trends. Many people use both, especially when:
Modern CGMs can be very accurate, but no sensor is perfect. Accuracy can vary due to hydration, compression (lying on the sensor), sensor age, insertion site, and rapid glucose changes. If you’re concerned about a reading, follow your CGM manufacturer’s guidance and confirm with a finger prick if advised.
CGMs read glucose in interstitial fluid, which can lag behind blood glucose during rapid changes (for example, after eating, exercise, or treating a low). This is normal and one reason trend arrows and graphs are so helpful.
A “compression low” is when a CGM may show a falsely low reading due to pressure on the sensor (often during sleep). If you suspect a compression low, change position and follow your device guidance (and confirm with a finger prick if recommended).
CGM alerts can notify you when glucose is trending high/low or has crossed a threshold you set. Alert types vary by device and app. If you’re unsure, check your CGM’s user guide or speak with your diabetes care team to set alerts that fit your lifestyle.
Some CGMs require calibration (finger prick entries) while others are factory-calibrated. Requirements vary by brand/model and sometimes by region. Always follow your CGM manufacturer’s instructions.
CGMs are used by people with Type 1 diabetes, Type 2 diabetes, people on insulin, and sometimes during pregnancy or for paediatric diabetes management. Your clinician can advise whether CGM is suitable for your needs and goals.
A CGM patch (also called an overpatch, sensor patch, or adhesive patch) is designed to go over and around your CGM sensor to help keep it secure. It can help reduce lifting edges, improve wear during sport and showers, and protect the sensor from knocks and accidental removal.
People use overpatches to help with:
Our CGM patches are designed to fit specific CGM models. Compatibility can vary by sensor shape and size, so please check the product page for your exact device before ordering.
Wear time depends on your skin type, activity level, climate, and how you apply the patch. Many people wear an overpatch for the full life of their sensor, while others replace the patch if edges lift or if the patch becomes dirty or uncomfortable.
Most CGM sensors are designed to handle everyday water exposure (like showering), but each brand has its own guidance. Our patches are designed to help your sensor stay secure during normal daily activities, including showers and swimming, when applied correctly.
In most cases, yes. After showering or swimming, pat the patch dry (don’t rub). Avoid high heat (like a hair dryer on hot) directly on the patch, as heat can affect adhesives.
Yes—CGM patches are commonly used to improve adhesion during workouts, sport, and hot weather. Sweat, friction, and movement can cause sensor tape to lift, so an overpatch can help keep everything in place.
Heat and humidity can make adhesion more challenging. The best way to improve wear is strong skin prep (clean, dry, oil-free skin) and allowing time for the adhesive to bond before heavy sweating or swimming.
Many people with sensitive skin use CGM patches successfully, but everyone’s skin is different. If you’re prone to irritation, we recommend doing a small patch test first and using gentle skin prep and removal methods.
Mild itching can happen, especially in hot weather or if moisture gets trapped under the patch. If you experience redness, burning, blistering, or worsening irritation, remove the patch and follow your healthcare professional’s advice.
Signs of an adhesive reaction can include persistent redness, burning, swelling, blistering, or a rash that worsens over time. If you suspect an allergy:
Pro tip: Warm hands can help activate adhesive—press and hold the patch for 20–30 seconds after applying.
If edges lift, this is common with movement, sweat, and friction. You can often extend wear by pressing edges down firmly. If the patch is significantly lifting or catching on clothing, it may be best to replace it.
If your sensor or patch frequently comes loose, the most common causes are skin oils, sweat, friction, or applying too soon after showering/exercise. Try:
If you’re still having issues, contact us—often a small tweak to prep or placement makes a big difference.
Always follow your CGM manufacturer’s approved wear locations. Common areas include the upper arm or abdomen, depending on the device and your region. Placement can affect comfort, adhesion, and accuracy.
If you have body hair where the sensor sits, trimming can help adhesion and make removal easier. If you shave, do it at least 24 hours before applying to reduce irritation and micro-cuts.
Try to avoid lotions, sunscreen, and oils directly under or immediately around the patch, as they can weaken adhesion. If you need sunscreen, apply it around the area (not under the adhesive) and let it dry fully.
Slow, gentle removal helps protect your skin. If you have sensitive skin, consider using an adhesive remover (as recommended by your pharmacist/clinician) and remove the patch in the direction of hair growth.
Adhesive residue can often be removed with warm soapy water, gentle oil-based cleansers, or an adhesive remover product. Avoid harsh scrubbing, especially if skin is irritated.
A patch should not affect readings when used correctly because it sits on top of the sensor housing and surrounding skin. However, pressure on the sensor (for example, sleeping directly on it) can contribute to “compression lows” on some devices.
Rules vary by CGM brand and the type of scan. Some devices must be removed for MRI and certain imaging procedures. Always follow your CGM manufacturer’s guidance and the imaging clinic’s instructions.
Many people travel with CGMs daily. Airport screening guidance can vary by device and country. Check your CGM manufacturer’s travel guidance and consider carrying a letter from your clinician if needed.
Many families use overpatches to help keep sensors secure for children, especially during school, sport, and swimming. Always supervise application/removal and follow your CGM manufacturer’s guidance for paediatric use and approved wear locations.
Comfort often comes down to placement and reducing pressure on the sensor. If you experience compression lows or discomfort, try adjusting placement (within manufacturer guidelines) and avoid sleeping directly on the sensor.
Yes. We offer a range of colours and designs so you can choose a discreet look (like beige) or something more fun and expressive. Availability can vary by device model and pack size.
Contact our support team if you need help choosing the right patch, have questions about application, or want product-specific details. Contact your healthcare professional or CGM manufacturer if you have persistent skin reactions, sensor failures, or concerns about glucose readings.
Need help? Email cs@ibdmedical.com.au or call (02) 8398 7520 (Mon–Fri, 9:00am–5:00pm Sydney time).
This FAQ is general information only and does not replace medical advice. Always follow your CGM manufacturer’s instructions and consult your healthcare professional for personalised guidance.
