Finger prick blood glucose readings and sensor glucose reading won't always match and in fact are likely to be different.
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That's because sensor glucose readings come from the interstitial fluid (ISF), a thin layer of fluid that surrounds the cells of the tissues below your skin, not from your blood.
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There is a 5 to 10-minute delay in ISF glucose response to changes in blood glucose.1 Glucose readings on ISF have been proven to reliably reflect glucose levels.2
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​Here's a video tutorial from Abbott to help show how blood glucose readings are different from sensor readings

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This article was sourced from: https://www.freestylelibre.com.au/difference-between-glucose-interstitial-glucose