Patent ID: 8481329

Claim:
An analysis system for the photometric determination of an analyte in a body fluid, the system comprising an analysis instrument and a test carrier, the test carrier comprising an evaluation zone in which a photometrically detectable change occurs as a result of a reaction of a sample of the body fluid contacted to the test carrier with a reagent contained in the test carrier, the analysis instrument comprising: an optical emitter for emitting light onto the evaluation zone of the test carrier; an optical receiver for receiving light from the evaluation zone and for generating a measurement signal corresponding to the received light; a measuring and evaluation device having a measuring unit and an evaluation unit, wherein the measuring unit is capable and adapted for amplifying and digitizing the measurement signal generated by the receiver, the evaluation unit is capable and adapted for determining the desired concentration value from the digitized measurement signal using an evaluation algorithm, which comprises a production-method-specific assignment of concentration values to the values of the digitized measurement signal, wherein in the evaluation algorithm at least one computing step is executed by means of a processor, the evaluation unit is capable and adapted for acquiring in the algorithmic sequence of steps the concentration value at an acquisition point downstream from the execution of the computing step, and wherein the concentration value is verified by means of a control algorithm by determining a deviation of the determined concentration value from a reference concentration value, the reference concentration value being determined from a reference measurement value using reference assignment data in the control algorithm, the reference assignment data assigning a plurality of reference concentration values to a plurality of reference measurement values, and wherein the analysis system is capable and adapted for recognizing an error of the measuring and evaluation device if the deviation of the concentration value from the reference concentration value exceeds a predefined limiting value.