Patent ID: 7758812

Claim:
Analytical system for determining an analyte in which non-analyte-dependent light intensity changes are taken into account comprising a test element having an absorption of light in a first wavelength range which is previously known and is not equal to zero, an illumination unit configured and arranged to emit radiation in the first wavelength range and in a second wavelength range, and configured and arranged within the system to irradiate the test element, a detector unit which is positioned in such a manner that light transmitted or reflected by the test element is registered, an evaluation unit configured and arranged within the system to receive signals from the detector when it is irradiated, the evaluation unit being further configured to (i) determine a correction value from an absorption of the test element in the first wavelength range before sample application, (ii) determine a measured value in the second wavelength range wherein the measured value in the second wavelength range is dependent on the analyte concentration after sample application on the test element, and (iii) determine the concentration of the analyte from the measured value taking into account the correction value.