Portable, patient-operable analytical device for analysis of a medically significant component of a body fluid for self monitoring by a patient, in particular a blood glucose measuring device, comprising a device housing, a measuring facility arranged inside the device housing for carrying out the analysis on a test element that is inserted through a housing opening into the analytical device and the measuring facility, wherein the analytical device is configured to carry out the analysis on a mutually adapted test element that contains a reagent, such that when the test element is contacted with a liquid sample of the body fluid the reaction between the liquid sample and the reagent leads to a change in the test element that is characteristic of the analysis, wherein the analytical device is adapted to analyze the change in the test element when it is inserted through the housing opening into the analytical device, and a processor with software for processing of the measuring values determined by the measuring facility and for processing the measuring values, to yield analytical measuring data taking into account calibration values, characterized in that the analytical device comprises a standardized, wire-based computer interface, wherein by means of the computer interface - the analytical device can be operated by a computer, - the analytical measuring data can be transmitted from the analytical device to the computer, and - the analytical device can be supplied with electrical power by the computer, wherein data in the form of instructions or control signals can be provided by the computer to the analytical device via the computer interface such that the computer can control operation of the analytical device in order to trigger the carrying out of an analysis with a test element that is inserted into the analytical device. a device housing, a measuring facility arranged inside the device housing for carrying out the analysis on a test element that is inserted through a housing opening into the analytical device and the measuring facility, wherein the analytical device is configured to carry out the analysis on a mutually adapted test element that contains a reagent, such that when the test element is contacted with a liquid sample of the body fluid the reaction between the liquid sample and the reagent leads to a change in the test element that is characteristic of the analysis, wherein the analytical device is adapted to analyze the change in the test element when it is inserted through the housing opening into the analytical device, and a processor with software for processing of the measuring values determined by the measuring facility and for processing the measuring values, to yield analytical measuring data taking into account calibration values, characterized in that the analytical device comprises a standardized, wire-based computer interface, wherein by means of the computer interface - the analytical device can be operated by a computer, - the analytical measuring data can be transmitted from the analytical device to the computer, and - the analytical device can be supplied with electrical power by the computer, - the analytical device can be operated by a computer, - the analytical measuring data can be transmitted from the analytical device to the computer, and - the analytical device can be supplied with electrical power by the computer, wherein data in the form of instructions or control signals can be provided by the computer to the analytical device via the computer interface such that the computer can control operation of the analytical device in order to trigger the carrying out of an analysis with a test element that is inserted into the analytical device.