Answer Summary

Members enthusiastically validated the original poster's findings about CGM accuracy, with several sharing their own comparisons between Libre... Read more

Members enthusiastically validated the original poster's findings about CGM accuracy, with several sharing their own comparisons between Libre and Dexcom sensors versus lab-drawn A1C tests, reporting differences of just 0.1% to 0.3% in most cases. Many members offered practical insights, including the importance of understanding MARD (mean absolute relative difference) accuracy ratings, keeping backup finger-prick test strips for wonky readings or suspected lows, calibrating new sensors with a reliable meter, and recognizing that CGMs measure interstitial fluid rather than blood directly, which can create a 15-minute lag and slightly lower readings during rapid changes. A recurring theme was gratitude for the detailed explanation of why different testing methods produce slightly different numbers, with members expressing renewed confidence in using their CGMs for daily management while acknowledging that perfection isn't the goal, consistency and overall accuracy are.