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In diabetes prevention
and care, invasiveness of glucose measurement
impedes efficient therapy and hampers the identification of people
at risk. Lack of calibration stability in non-invasive technology
has confined the field to short-term proof of principle. Addressing
this challenge, we demonstrate the first practical use of a Raman-based
and portable non-invasive glucose monitoring device used for at least
15 days following calibration. In a home-based clinical study involving
160 subjects with diabetes, the largest of its kind to our knowledge,
we find that the measurement accuracy is insensitive to age, sex,
and skin color. A subset of subjects with type 2 diabetes highlights
promising real-life results with 99.8% of measurements within A +
B zones in the consensus error grid and a mean absolute relative difference
of 14.3%. By overcoming the problem of calibration stability, we remove
the lingering uncertainty about the practical use of non-invasive
glucose monitoring, boding a new, non-invasive era in diabetes monitoring.
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