A kind of method, comprising: the bG in measurement blood glucose (blood) is horizontal It stores the time of bG levels and receives blood sample Storage classification blood sample In response to receiving the blood sample, selects the bG levels of one group of storage that there is classification blood sample and receive blood sample before receiving in a predetermined period It is horizontal from selected bG to calculate bG evaluation parameters When assessing bG evaluation parameters relative to the first predetermined criterion, the first predetermined criterion includes that first threshold indicates that high bG levels or low bG are horizontal It selectively shows that the selected bG levels of the identification of indicating mode are greater than in bG evaluation parameters and is also less than first threshold It indicates with being optionally removed from display.