A blood glucose system for treating a glucose metabolic disorder, comprising - a portable, autonomous, outpatient-operable dosing device for delivering a medicinal active substance for treating glucose metabolic disorders in a body, which comprises an integrated time counter for generating relative time values, a storage unit in which data sets of dosing quantities and associated time values are stored and an apparatus for transferring stored data sets to a data processing device, and - a portable, autonomous, outpatient-operable blood glucose meter for determining the blood glucose content of the body, comprising an integrated time standard and a storage unit in which data sets from blood glucose measurements and associated time values are stored, and an apparatus for transferring stored data sets to a data processing device, - a data processing device for processing data sets of the dosing device and the blood glucose meter, with a receiving apparatus for receiving the data sets from the dosing device and the blood glucose measuring device and a computing unit for converting the time values of the data sets of the dosing device into absolute time values based on a comparison of the time value of the time counter of the dosing device with the time value of a time standard, - wherein the data processing device is embodied to synchronise the data sets of the dosing device and the data sets of the blood glucose meter with each other by means of the time value of the time standard by an associated link, characterised in that the dosing device has a needle sensor with which it is detectable whether the needle used is in the body during the delivery of an active substance, and the needle sensor is also used as a priming sensor, wherein the bolus is evaluated as priming and the stored data set is marked accordingly when a bolus is delivered without the needle being injected into the body. - a portable, autonomous, outpatient-operable dosing device for delivering a medicinal active substance for treating glucose metabolic disorders in a body, which comprises an integrated time counter for generating relative time values, a storage unit in which data sets of dosing quantities and associated time values are stored and an apparatus for transferring stored data sets to a data processing device, and - a portable, autonomous, outpatient-operable blood glucose meter for determining the blood glucose content of the body, comprising an integrated time standard and a storage unit in which data sets from blood glucose measurements and associated time values are stored, and an apparatus for transferring stored data sets to a data processing device, - a data processing device for processing data sets of the dosing device and the blood glucose meter, with a receiving apparatus for receiving the data sets from the dosing device and the blood glucose measuring device and a computing unit for converting the time values of the data sets of the dosing device into absolute time values based on a comparison of the time value of the time counter of the dosing device with the time value of a time standard, - wherein the data processing device is embodied to synchronise the data sets of the dosing device and the data sets of the blood glucose meter with each other by means of the time value of the time standard by an associated link,