11: CGM Accuracy (Part 2): Understanding MARD, 20/20, 40/40, and Error Grids.

Suggest guests or get in contactIn this episode of the Glucose Never Lies podcast, hosts John Pemberton and Louise discuss the intricacies of diabetes management, focusing on continuous glucose monitoring (CGM) systems. They explore the importance of CGM accuracy, the standards set by regulatory bodies, and the significance of testing conditions in evaluating these devices. The conversation delves into various metrics used to assess CGM performance, including MARD, 20/20 and 40/40 agreement rates, and highlights the need for robust testing against capillary glucose to ensure effective diabetes management. The episode emphasises the importance of transparency in CGM studies and the future directions for standardizing testing protocols.takeawaysCGM systems are crucial for real-time glucose monitoring.FDA standards are currently the highest for CGM performance.CE marking does not guarantee device accuracy or reliability.Testing conditions significantly impact CGM accuracy results.The 20/20 standard indicates no risk for insulin dosing decisions.The 40/40 metric identifies high-risk readings in CGM data.Robust testing against capillary glucose is essential for accuracy.Standardization in CGM testing is needed for better diabetes management.Transparency in CGM studies is vital for healthcare professionals and patients.00:00Introduction to Diabetes Management and Podcast Goals02:07Understanding Continuous Glucose Monitoring (CGM) Systems06:08Evaluating CGM Accuracy and Performance Standards10:09The Importance of Testing Conditions in CGM Studies14:13Metrics for Assessing CGM Accuracy18:03Comparing CGM Systems Against Capillary Glucose22:02Future Directions for CGM Testing and StandardsKey ResourcesCGM Series: Assessing CGM Accuracy PerformanceChart for CGM Devices (From May 2025): DSN ForumTim Street @ DiabettechSupport GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00The Glucose Never Lies® is a registeDisclaimerThis podcast is for education and informational purposes only. It does not constitute medical advice and is not a substitute for individualised care.The Glucose Never Lies® is independent by designWe do not accept sponsorships and advertising. We operate via education grants and donations from listeners who value independence. So, consider:Buying the GNL a Coffee:https://www.buymeacoffee.com/jspfree2EnquiriesCollaboration: John Pemberton — [email protected]: Anjanee Kohli — [email protected] The Glucose Never Lies®Website: https://theglucoseneverlies.com/Instagram: https://www.instagram.com/theglucoseneverliesLinkedIn: https://www.linkedin.com/company/theglucoseneverliesLinkedIn: John Pemberton: https://www.linkedin.com/in/john-pemberton-587104361/X: https://twitter.com/GlucoseNLiesDisclaimer This content is for informational purposes only and does not constitute medical advice.© The Glucose Never Lies Ltd. All rights reserved.