Suggest guests or get in contact

CGM Series | The Glucose Never Lies® Podcast

CGM accuracy is usually described with a single number: MARD. But a low MARD can hide significant risk if the study behind it was poorly designed. Professor Othmar Moser — one of the leading independent CGM accuracy researchers — explains what study design actually determines, why meal and insulin challenges are non-negotiable, and what people with type 1 diabetes and clinicians should look for when evaluating any accuracy claim.

In this episode:

• What MARD is and why it misleads when used in isolation
• The five study design questions that determine what accuracy data actually means
• Why 20/20 and 40/40 agreement rates reveal what MARD cannot
• Why meal and insulin challenges are essential for real-world accuracy testing
• What CE marking does and does not guarantee about CGM performance
• Why peer-reviewed, independent evidence is the gold standard — and how little of what is cited meets it
• How study design quality shapes what we actually know about CGM risk
• Professor Moser's perspective as a researcher who designs and runs these studies

Guest: Professor Othmar Moser, Medical University of Graz, Austria. Leading figure in independent CGM accuracy study design and insulin-related exercise physiology research in type 1 diabetes.

Links:

• Full show notes: https://theglucoseneverlies.com/episode-35-cgm-series-the-importance-of-cgm-accuracy-and-study-design-with-professor-othmar-moser/
• CGM Guide Part 2 — Assessing CGM Accuracy: https://theglucoseneverlies.com/assessing-cgm-accuracy-performance/
• CGM Guide Part 1 — How to Choose a CGM: https://theglucoseneverlies.com/select-continuous-glucose-monitor-cgm-understanding/
• Episode 36 — DSN Forum: CGM Accuracy and ATTD 2025: https://theglucoseneverlies.com/episode-36-cgm-accuracy-dsn-forum/
• Watch on YouTube: https://youtu.be/zTdTps42kQ8

Educational purposes only. Not medical advice. Always work with your diabetes care team.

Support GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Disclaimer

This 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 design

We 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/jspfree2

Enquiries

Collaboration: John Pemberton — john@theglucoseneverlies.com

Creatives: Anjanee Kohli — anj@theglucoseneverlies.com

Follow The Glucose Never Lies®

Website: https://theglucoseneverlies.com/

Instagram: https://www.instagram.com/theglucoseneverlies

LinkedIn: https://www.linkedin.com/company/theglucoseneverlies

LinkedIn: John Pemberton: https://www.linkedin.com/in/john-pemberton-587104361/

X: https://twitter.com/GlucoseNLies

Disclaimer
This content is for informational purposes only and does not constitute medical advice.

© The Glucose Never Lies Ltd. All rights reserved.