Key Statistics: CGM users check their glucose approximately 16 times per day compared to just 4 times with traditional fingerstick testing. Studies show proper sensor insertion technique reduces early sensor failures by up to 40%. With CGM adoption among Medicare beneficiaries increasing over 300% since 2020, more seniors than ever are learning these essential insertion skills.
Applying a CGM sensor for the first time can feel intimidating, but with the right preparation and technique, it becomes routine quickly. This guide walks you through proven CGM sensor insertion tips for seniors, specifically designed to make sensor insertion easier, more comfortable, and more successful.
About This Guide: This guide is based on official manufacturer instructions from Dexcom and Abbott FreeStyle. Our step-by-step recommendations are reviewed by certified diabetes educators and incorporate feedback from hundreds of senior CGM users.
Related Reading: Choosing your first CGM? See our Dexcom G7 vs FreeStyle Libre 3 Comparison Guide to find the right system for you. For over-the-counter options, explore our Stelo OTC CGM Guide.
Before You Begin: Preparation Checklist
Quick Answer: Successful CGM insertion requires proper preparation. Gather your sensor, alcohol wipes, a clean towel, good lighting, and reading glasses. Let refrigerated sensors warm to room temperature for 20-30 minutes. This preparation prevents common problems and makes insertion much smoother.
Proper preparation is the foundation of successful sensor insertion. Taking a few extra minutes to prepare can prevent common problems and make the process much smoother.
Gather Your Supplies
- Your CGM sensor and applicator – Check expiration date before opening
- Alcohol wipes – For cleaning the insertion site
- A clean, dry towel – To dry the area completely
- Good lighting – Essential for seeing what you’re doing
- Reading glasses – If you normally use them for close work
- A mirror – Helpful if applying to the back of your arm
Let the Sensor Warm Up
Important: Remove your sensor from the refrigerator (if stored there) at least 20-30 minutes before insertion. A cold sensor can cause more discomfort during insertion and may affect accuracy during the warm-up period.
Choosing the Best Insertion Site
Quick Answer: The back of the upper arm is the best CGM insertion site for seniors. It’s easier to protect from bumps, less affected by daily activities, and approved for all major CGM systems. Rotate between left and right arms, and avoid scars, moles, and bony areas.
Where you place your sensor significantly impacts comfort and accuracy. Here are the approved sites and tips for each:
| CGM System | Approved Sites | Best for Seniors |
|---|---|---|
| FreeStyle Libre 3 | Back of upper arm | ✓ Back of upper arm (most accurate) |
| Dexcom G7 | Abdomen, back of upper arm | ✓ Back of upper arm (easier to protect) |
| Stelo | Back of upper arm | ✓ Back of upper arm only |
Site Selection Tips
- Rotate sites: Alternate between left and right arms to give skin time to heal
- Avoid: Scars, moles, tattoos, stretch marks, and areas with visible veins
- Stay away from: Bony areas, joints, and places where clothing rubs
- Choose fatty tissue: The sensor works best in areas with some subcutaneous fat
- Consider your sleep position: If you sleep on one side, place the sensor on the opposite arm
Step-by-Step Insertion Guide
Quick Answer: CGM insertion involves four steps: clean the site with alcohol and let dry completely, prepare the applicator without touching the adhesive, hold at 90 degrees and press firmly to insert, then secure edges and activate through your app. Most people describe it as a brief pinch.
Step 1: Clean the Site Thoroughly
- Clean the area with an alcohol wipe using circular motions from center outward
- Let the skin dry completely (at least 30 seconds) – this is crucial!
- Do not blow on the area or wave your arm to speed drying
- Avoid lotions, oils, or creams on insertion day
Step 2: Prepare the Applicator
- Wash and dry your hands thoroughly
- Remove the applicator from its packaging
- Do not touch the adhesive or the sensor filament
- Follow the specific instructions for your CGM brand
Step 3: Apply the Sensor
- Hold the applicator at a 90-degree angle to your skin
- Press the applicator firmly against your skin
- Push the button or press down (varies by device)
- Hold in place for 5-10 seconds before removing the applicator
- The insertion happens quickly – most people describe it as a brief pinch
Step 4: Secure and Activate
- Press gently around all edges of the adhesive to ensure good contact
- Open your CGM app and follow the activation instructions
- Note the warm-up time: FreeStyle Libre 3 (1 hour), Dexcom G7 (30 minutes), Stelo (1 hour)
Tips for Common Senior Challenges
Quick Answer: Seniors with limited mobility can use a mirror or ask for help. Those with thin skin should use barrier wipes like Cavilon. For vision difficulties, use bright direct lighting, reading glasses, and mark the insertion spot while you can see clearly.
Limited Arm Mobility or Arthritis
- Ask for help: Have a family member, caregiver, or neighbor assist with insertion
- Use a mirror: Position a full-length mirror to see your arm better
- Consider the abdomen: If your CGM is approved for abdomen use, this may be easier to reach
- Practice the motion: Before inserting, practice the pressing motion without the sensor
Thin or Fragile Skin
- Pinch gently: Some find that slightly pinching the skin helps
- Use skin prep products: Skin-Tac or similar products can help adhesion without irritation
- Consider barrier wipes: Products like Cavilon create a protective layer
- Be extra gentle: When removing old sensors, use adhesive remover to prevent skin tears
Vision Difficulties
- Use bright, direct lighting: A desk lamp pointed at your arm helps
- Wear reading glasses: Use your strongest readers for close work
- Use a magnifying mirror: Available at most drugstores
- Mark the site: Use a washable marker to mark your insertion spot while you can see clearly
Keeping Your Sensor Secure
Quick Answer: Keep sensors attached by using manufacturer-provided overpatches, applying Skin-Tac before insertion, and patting (not rubbing) dry after showering. Avoid friction from seatbelts and tight sleeves. Clean skin thoroughly and ensure it’s completely dry before applying.
Sensor adhesive can loosen over time, especially in humid weather or during physical activity. Here are proven strategies to keep your sensor attached:
- Overpatch: Apply a manufacturer-provided or aftermarket overpatch for extra security
- Medical tape: Hypoallergenic tape around edges can extend wear time
- Skin prep: Apply Skin-Tac before insertion (let it dry first)
- Avoid friction: Be mindful of seatbelts, purse straps, and tight sleeves
- Pat dry: After showering, pat – don’t rub – around the sensor
Troubleshooting Common Issues
Quick Answer: Common CGM problems have simple solutions. Sensor falling off? Use skin prep and overpatches. Inaccurate readings? Stay hydrated and avoid sleeping on the sensor. Skin irritation? Try barrier wipes and rotate sites. Most issues resolve with minor adjustments to your routine.
| Problem | Likely Cause | Solution |
|---|---|---|
| Sensor falls off early | Moisture, oils on skin, or friction | Clean skin better, use skin prep, apply overpatch |
| Painful insertion | Hitting a nerve or blood vessel | Try a different site next time; minor discomfort is normal |
| Inaccurate readings | Compression, dehydration, or site issues | Stay hydrated, avoid sleeping on sensor, check site |
| Skin irritation | Adhesive sensitivity | Try barrier wipes, rotate sites, contact manufacturer |
| Sensor error message | Various technical issues | Wait 15 minutes, restart app; call support if persists |
When to Contact Support
Quick Answer: Contact manufacturer support for repeated sensor failures, significant pain or bleeding, signs of infection (redness, swelling, pus), severe skin reactions, or readings that consistently don’t match fingerstick tests. Dexcom: 1-888-738-3646. FreeStyle Libre: 1-855-632-8658.
Contact your CGM manufacturer’s customer support if you experience:
- Repeated sensor failures or errors
- Significant pain or bleeding at the insertion site
- Signs of infection (redness, swelling, warmth, pus)
- Severe or persistent skin reactions
- Readings that consistently don’t match fingerstick tests
Manufacturer Support Numbers:
- FreeStyle Libre: 1-855-632-8658
- Dexcom: 1-888-738-3646
- Stelo: Visit dexcom.com/stelo for support
Related Resources for Seniors
Explore more CGM guides designed specifically for older adults:
- Dexcom G7 vs FreeStyle Libre 3 Comparison – Complete guide to prescription CGM options
- Stelo OTC CGM Guide – First over-the-counter glucose monitor for seniors
Frequently Asked Questions About CGM Sensor Insertion
Does CGM sensor insertion hurt?
Quick Answer: Most people describe CGM sensor insertion as a brief pinch that lasts less than a second. The needle is very thin and the insertion is quick. Seniors often report that after 2-3 sensors, they barely notice the sensation. Letting the sensor warm to room temperature before insertion can reduce discomfort.
Where is the best place to insert a CGM sensor?
Quick Answer: The back of the upper arm is the most recommended site for seniors. It’s easier to protect from bumps, less affected by daily activities, and approved for all major CGM systems. Avoid bony areas, scars, moles, and places where clothing rubs. Always rotate between left and right arms.
How do I keep my CGM sensor from falling off?
Quick Answer: Clean your skin thoroughly with alcohol and let it dry completely before insertion. Use skin prep products like Skin-Tac for better adhesion. Apply manufacturer-provided overpatches for extra security. After showering, pat—don’t rub—around the sensor. Avoid lotions near the sensor site.
Can I shower with my CGM sensor?
Quick Answer: Yes, CGM sensors are water-resistant and designed to be worn during showering. Dexcom G7 can be submerged for 24 hours at 8 feet depth, while FreeStyle Libre 3 is rated for 30 minutes at 3 feet. Avoid directing high-pressure water directly at the sensor and pat dry gently afterward.
What should I do if my CGM sensor fails?
Quick Answer: First, wait 15 minutes and restart your CGM app—temporary errors often resolve. If the sensor continues to show errors, contact manufacturer support (Dexcom: 1-888-738-3646, FreeStyle Libre: 1-855-632-8658) for a free replacement. Keep the failed sensor and lot number when calling.
The Bottom Line
Quick Answer: CGM sensor insertion becomes routine with practice. Most seniors find the process natural by their third or fourth sensor. The keys to success are proper preparation, choosing good sites, and taking your time. Don’t be discouraged by initial awkwardness—it’s completely normal.
CGM sensor insertion becomes easier with practice. Most seniors find that by their third or fourth sensor, the process feels natural and routine. Don’t be discouraged if your first few insertions feel awkward – that’s completely normal. The key is proper preparation, choosing good sites, and not rushing the process.
Need help with your CGM or have questions about sensor insertion? Our team is here to help. Call us at 727-831-3729 for personalized guidance and support.
