How to Replace Your CGM Sensor — Step by Step

Welcome. Changing your continuous glucose monitor sensor is something most people can do confidently at home once they know the steps. Let's walk through the process together. Before you start, gather your supplies: a new sensor, your inserter device, alcohol wipes, and tape or an overlay patch if you use one. Step 1: Wash your hands thoroughly with soap and warm water for at least 20 seconds. Clean hands prevent infection at the insertion site. Step 2: Choose your insertion site. The most common sites are the back of the upper arm, the abdomen, or the upper buttocks. Rotate sites to give your skin time to heal between placements. Avoid areas with scar tissue, tattoos, or skin irritation. Step 3: Clean the site with an alcohol wipe and let it dry completely — about 30 seconds. Inserting into wet skin can cause adhesive failure. Step 4: Remove the sensor from its packaging and load it into the inserter according to your device's instructions. Do not touch the needle or sensor membrane. Step 5: Press the inserter firmly against your skin and trigger the insertion. Most devices click or snap. Hold the inserter in place for a few seconds after insertion, then remove it. Step 6: Apply tape or an overlay patch if needed to secure the sensor. Step 7: Allow the warm-up period. Most CGM sensors require 2 hours before they start displaying readings. Do not calibrate or enter fingerstick values until the sensor requests them. If your sensor fails or gives error readings in the first 24 hours, contact your DME provider — many manufacturers have replacement programs for failed sensors. Need CGM supplies or a new provider? Use the button below to find local coverage.