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CGM Patient Support: Setup, Pump Integration & Sensor Site Care

Official Patient Resource Guide for Dexcom & FreeStyle Libre Systems

How to Start Your Journey with Dexcom G7 or Libre 3

Getting started shouldn't be stressful. Follow these clinical steps to ensure your first reading is accurate.
 

  • Prep the Skin: Wash the area with plain soap and water. Avoid "moisturizing" soaps which cause the adhesive to peel.
     

  • Sanitize: Use a 70% Isopropyl Alcohol swab. Let the skin air-dry completely (about 60 seconds). If the skin is wet, the sensor will fail to stick.
     

  • Application:

    • Dexcom G7: Apply to the back of the upper arm. Press the applicator firmly and push the button.
       

    • Libre 3: Apply to the back of the upper arm. Press the applicator firmly until the sensor clicks into place.
       

  • Warm-Up: Both systems require a warm-up period (approx. 25–60 minutes). Do not attempt to calibrate during this time.
     

Syncing Your CGM with Insulin Pumps (Omnipod 5 & Tandem t:slim X2)

  • For patients using automated insulin delivery (AID), your CGM acts as the "brain."
     

  • The Connection: Your CGM transmitter talks directly to your pump via Bluetooth.
     

  • The Rule of One: Your CGM can only "talk" to one medical device (your pump) and one smart device (your phone) at the same time.
     

  • Troubleshooting Sync: If your pump loses the CGM signal, ensure the pump is worn on the same side of the body as the sensor. Bluetooth signals cannot travel through the body easily.
     

  • Dexcom G7 Tip: Ensure your pump firmware is updated to support G7 integration, as older models may require a manual update.

Maximize Sensor Life & Prevent Skin Irritation

  • To keep your skin healthy and ensure your sensor lasts the full 10–14 days, follow the "Clockwise Rotation" method.
     

  • Rotation Strategy: Never place a new sensor in the exact spot of the old one. Move at least 2 inches away.
     

  • Skin Barriers: If you have sensitive skin, use a "Skin-Prep" or "Mastisol" wipe before application to create a protective barrier.
     

  • Adhesive Patches: If your sensor edges start to lift (due to sweating or swimming), apply a medical-grade "Overpatch."
     

  • Safe Removal: Use an oil-based adhesive remover or baby oil to soak the sensor edges before peeling. This prevents "skin stripping" or redness.
     

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