A portable analytical device is provided for analysis of a component of a body fluid. A measuring facility within the device may carry out the analysis on a test element inserted therein. The test element may contain a reagent that reacts with a liquid sample of the body fluid when the test element is contacted thereby to produce a change that is characteristic of the analysis. A processor may process measuring values determined by the measuring facility to yield analytical measuring data taking into account calibration values. A standardized, wire-based computer interface may be provided on the analytical device via which the analytical device can be operated by a computer, the analytical measuring data can be transmitted from the analytical device to the computer, the analytical device can be supplied with electrical power by the computer, and the analytical device can provide software to be read-out by the computer.