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Biosense Clinical Trial - Biosense®
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Biosense® manufacturer Readout Health completed a 19-subject clinical trial in the fall of 2019. Healthy
individuals were asked to simultaneously measure their blood and breath ketones 5 times per day for 14 days.

Results of Clinical Trial

Breath and blood ketones both change, often dramatically over the course of a day. The patterns of ketone level changes are dependent upon the specific day and the individual.

Although breath and blood ketones tend to rise and fall together (graph a.), there is often a time offset between changes in blood ketones and changes in breath ketones (graphs b. and c.) For this reason, the correlation between coincident blood and breath measurements in our study and in the literature (Refs. 1-3) appears moderate (R2 ~ 0.6).

Because ketone levels often vary greatly throughout the day, a single ketone measurement provides a limited view of an individual’s metabolic state. In order to capture cumulative progress over time, we calculated a daily area under the curve (AUC.)

The AUC is a summary of the accumulated depth and duration of nutritional ketosis each day. It answers the question, “how deeply and for how long have I been in ketosis?” with a single number.

Our clinical data showed a very high correlation between breath and blood AUCs (R2 = 0.83). Stated differently, using a breath or a blood device to take multiple measurements per day, which is necessary to capture the high variability of daily ketone levels, provides very similar indications of overall ketone activity.

Results of Clinical Trial

  • Multiple (either breath or blood) ketone measurements per day are likely necessary to capture the full picture of daily
    ketone exposure.
  • Breath and blood ketones appear to be offset in time, with blood ketones usually changing first followed by breath ketones.
  • Additional studies are needed to fully characterize these changes.
  • The daily area under the curve (AUC), or Ketone Score, provides a more comprehensive method for assessing daily
    ketone production.
  • The AUCs from breath or blood measurements are highly correlated.

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