Biosensor system and method for the electrochemical determination of an concentration of an analyte in a sample. An analyte reactant is at least partially hydrated by the sample to form a reaction layer in contact with electrodes for measurement of an analyte detection current. The analyte detection current is characteristic of the analyte concentration in the sample by virtue of a reaction sequence comprising an analyte-specific reaction taking place in the reaction layer and an electrode reaction including transfer of electrons through an electrode surface. A plurality of values of a curve of the analyte detection current versus time are measured and the analyte concentration is derived therefrom by means of an evaluation algorithm. Fast results of high accuracy are achieved in that the DC-voltage is applied to the electrodes during the analyte-specific reaction whereby the analyte-specific reaction and the electrode reaction take place generally simultaneously resulting in an analyte detection current versus time curve which comprises a rising section in which the current increases versus time and the analyte detection current is measured at at least two points of time in the rising section and the values of the analyte detection current resulting from said at least two measurements are used in the evaluation algorithm for error compensation.