cgm-monitors
FreeStyle Libre 3
The Libre 3 is the smallest, thinnest CGM on the market (the size of two stacked pennies), offering the highest clinical accuracy (7.9% MARD) available in a consumer-ready device. It provides minute-by-minute readings directly to a smartphone without the need for manual scanning.
Quality & Materials
Utilizes a proprietary wired-enzyme technology. The sensor filament is extremely thin and flexible, reducing the inflammatory response at the insertion site compared to older, thicker filaments.
Evidence & Testing
Clinical trials demonstrated an overall MARD of 7.9%, which is currently the lowest (most accurate) in the industry for a continuous monitor.
Brand Transparency
Abbott is transparent about clinical data but their primary app is designed for medical use; data portability to longevity apps (like Apple Health) can sometimes be more restricted compared to Dexcom.
Value Assessment
If purchased with a prescription but without insurance, it often retails for $75-$150 for a 28-day supply (two 14-day sensors), making it highly competitive for those who can obtain a script.
Why Not Alternatives?
It is significantly smaller than the Dexcom G7 and generally has a lower out-of-pocket cost at pharmacies. While the app is less 'longevity-focused' than third-party platforms, the hardware's accuracy beats almost all competitors.
Sources & References
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