Patent ID: 8357274

Claim:
An electrochemical biosensor analysis system for analyzing a sample liquid, comprising: a biosensor comprising a carrier layer, an electrode structure located on the carrier layer and comprising at least two electrodes, a test field located on the carrier layer and covering the electrode structure, the test field comprising at least one layer of a material, the material configured to absorb the sample liquid, the test field further comprising a reagent system configured to react with the sample liquid and to produce a change of an electrical measurement variable, said measurement variable being characteristic for a desired analysis result and measurable by means of an analysis measurement employing the at least two electrodes, the biosensor further comprising a sample application surface on an upper side of the test field, the sample application surface facing generally away from the carrier layer and wherein the sample liquid penetrates through the sample application surface and into the test field via contact of the sample liquid onto the sample application surface from a location above the test field; and an analysis instrument comprising an analytical measuring device configured for measuring the measurement variable of a sample liquid on the biosensor when the biosensor is positioned in a measurement position and electrically connected to the measuring device, the instrument further comprising an evaluation unit configured for determining the desired analysis data from measured values of the measurement variable; wherein each of the at least two electrodes of the electrode structure comprises an array of conductor strips distributed on an effective electrode structure area, which area is wettable by the sample liquid, the distribution of the conductor strips of the electrode structure on the effective electrode structure area being generally homogeneous with respect to an AC resistance measurement performed on a liquid layer having a defined conductivity and layer thickness; wherein the effective electrode structure area wettable by the sample liquid is congruently aligned with the sample application surface to which the sample liquid is applied, and the test field is configured for spreading a droplet of sample liquid applied to the sample application surface over at least a partial area of the sample application surface and for wetting a corresponding aligned area of the effective electrode structure area; and the analysis instrument comprises an AC resistance measuring device configured for performing an area compensation measurement by measuring an AC resistance value between the at least two electrodes of the electrode structure, the measured AC resistance value being used, in the determination of the analysis data, as a measure of the extent that the area of the effective electrode structure area is wetted by the sample liquid.