Method and system for method for determining a blood glucose level for a patient

A method for determining a blood glucose level for a patient, the method comprising, in a system for determining the blood glucose level for the patient,

• detecting a present sensor signal at a measuring time tm in a present continuous interstitial blood glucose measurement for a patient;
• providing measurement data representing the present sensor signal;
• providing sensor signal correction data representing, for the patient, a patient-specific signal correction, the sensor signal correction data being determined from a former interstitial blood glucose measurement for the patient and comprising time delay data representing, for the patient, a patient-specific time delay Δt between a blood glucose value measured in a continuous interstitial blood glucose measurement and a blood glucose reference value measured in a capillary blood glucose measurement, the blood glucose value and the blood glucose reference value referring to the same blood glucose level;
• determining corrected measurement data representing a corrected present sensor signal by applying the sensor signal correction data to the present sensor signal;
• and
• determining a blood glucose level for the patient from the corrected measurement data;
• wherein the applying the sensor signal correction data is further comprising
• determining blood glucose level data representing a previous blood glucose level of the patient at a previous time tpr=tm−Δt by determining a blood glucose value from the measurement data and assigning the blood glucose value to the previous time tpr;
• providing rate of change data representing a rate of change of the blood glucose level of the patient;
• and
• providing future blood glucose level data representing a future blood glucose level of the patient at a future time tf=tm+Δt by determining a future blood glucose value from the blood glucose value at the previous time tpr and the rate of change of the blood glucose level.

A system for determining a blood glucose level for a patient, comprising:

• a blood glucose measurement device configured to detect a present sensor signal at a measuring time tm in a present continuous interstitial blood glucose measurement for a patient, and
• an analyzing device, comprising a data processing device, configured to provide
• measurement data representing the present sensor signal;
• sensor signal correction data representing, for the patient, a patient-specific signal correction, the sensor signal correction data being determined from a former interstitial blood glucose measurement for the patient and comprising time delay data representing, for the patient, a patient-specific time delay Δt between a blood glucose value measured in a continuous interstitial blood glucose measurement and a blood glucose reference value measured in a capillary blood glucose measurement, the blood glucose value and the blood glucose reference value referring to the same blood glucose level;
• corrected measurement data representing a corrected present sensor signal by applying the sensor signal correction data to the present sensor signal;
• and
• a blood glucose level for the patient from the corrected measurement data
• wherein the data processing device is further configured, in the applying of the sensor signal correction data, to
• determine blood glucose level data representing a previous blood glucose level of the patient at a previous time tpr=tm−Δt by determining a blood glucose value from the measurement data and assigning the blood glucose value to the previous time tpr;
• provide rate of change data representing a rate of change of the blood glucose level of the patient;
• and
• at least one of the following:
• provide present blood glucose level data representing a present blood glucose level of the patient at the measuring time tm by determining a present blood glucose value from the blood glucose value at the previous time tpr and the rate of change of the blood glucose level;
• and
• provide future blood glucose level data representing a future blood glucose level of the patient at a future time tf=tm+Δt by determining a future blood glucose value from the blood glucose value at the previous time tpr and the rate of change of the blood glucose level.