Should I compare back-to-back results?
- Intuitively, it may seem that comparing back-to-back results from the same glucose or glucose-ketone meter would be a helpful way to determine its accuracy or to receive more accurate readings, but that’s actually not the case
- First, keep in mind that expected variations in readings will occur:
- +/- 15% variation compared to baseline lab results, 95% of the time
- +/- 20% variation compared to baseline lab results, 99% of the time
- Therefore, for example, a repeat reading of a lab-validated glucose sample that’s 100 mg/dL would be expected to range from 85-115 mg/dL with a home glucometer
- Beyond that, performing back-to-back readings at home further decreases accuracy for these reasons:
- If you use a single sample (blood droplet), prolonged exposure to air skews readings because glucose oxidizes (reacts to oxygen)
- Blood glucose levels can change rapidly in your body, so even samples taken close to one another in time can be different
- Taking readings using samples from different fingers may result in differences because the glucose content of fluids from different body areas can be different
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