Sometimes the reference finger blood glucose values and the illustration do not overlap; if this happens, may be due to one or more of the following reasons:

1. There is a dynamic inconsistency between the subcutaneous tissue fluid glucose and the blood from the finger test: the sensor measures the glucose of subcutaneous tissue fluid, while the finger glucose meter measures the capillary blood. The above are consistent only when blood glucose remains in a stable state (with no rapid change). When the glucose undergoes a rapid change (e.g., 1.5 hours after a meal, drinking a beverage with glucose, or after insulin injection), the glucose measure from the finger test and the illustration are not strictly consistent. It is normal that some individual points are inconsistent with the curve on the whole illustration.
2. External variables in the use of the glucose meter. (e.g., users have not washed hands before measuring; users squeeze the figures too hard and break the blood cells; different quality of test paper; blood volume inhalation too low)
3. During the three days’ wearing period, either one or two glucose meters are used with different batches of test strips. There is a system deviation between the use of two meters and the different batches of test papers.
4. Either the sensor is not inserted completely, the finger blood glucose is measured during the polarizing period, before the sensor begins working normally, the sensor does not monitor the tissue fluid glucose correctly, so that the data on the curve are not the correct glucose signals, and there is no correlation between the points and the curve.
5. A mistake in the recording or inputting reference glucose (time and values). For example, recording 6:00 pm for 16:00 in the recorder card, may result in the illustration deviation.