Blood glucose (pricked) does not always correspond to glucose measured by the sensor.

Finger prick blood glucose readings and sensor-measured glucose will not always be the same, and are likely to differ. This is because the sensor measures glucose in the interstitial fluid (ISF), a thin layer of fluid surrounding the cells of the tissues under the skin, not in the blood. The glucose values in the ISF are 5 to 10 minutes behind changes in blood glucose. Glucose measurements based on ISF appear to be a reliable representation of the glucose level.
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