Method for analysing a sample medium by means of a support comprising at least one optochemical detection surface, comprising the steps of: arranging the support in a target position indicated by means of a first marking on a first wall component of a scaffold structure; positioning an image evaluation device with regard to the scaffold structure in a target placement position indicated by means of a second marking on a second wall component of the scaffold structure, the result being that the at least one optochemical detection surface of the support is arranged in a field of view of the image evaluation device and at a distance from the image evaluation device that is fixedly predetermined by the scaffold structure, wherein, after the arrangement of the support in its target position and after the positioning of the image evaluation device with regard to the scaffold structure in its target placement position, the at least one optochemical detection surface of the support is wetted with the sample medium or exposed to the sample medium; and carrying out at least one measurement, by means of the image evaluation device present with regard to the scaffold structure in its target placement position, on the at least one optochemical detection surface of the support arranged in its target position and evaluating the at least one measurement by means of the image evaluation device, wherein the support is arranged in the target position with a protective film covering its at least one optochemical detection surface, characterized in that, after the arrangement of the support bearing the protective film in its target position, a calibration measurement is carried out, by means of the image evaluation device present with regard to the scaffold structure in its target placement position, on the at least one optochemical detection surface of the support arranged in its target position, the protective film is removed from the at least one optochemical detection surface of the support after the calibration measurement and the at least one exposed optochemical detection surface is wetted with the sample medium or exposed to the sample medium, and wherein the evaluation of the at least one measurement by means of the image evaluation device is effected taking into account the calibration measurement previously carried out. arranging the support in a target position indicated by means of a first marking on a first wall component of a scaffold structure; positioning an image evaluation device with regard to the scaffold structure in a target placement position indicated by means of a second marking on a second wall component of the scaffold structure, the result being that the at least one optochemical detection surface of the support is arranged in a field of view of the image evaluation device and at a distance from the image evaluation device that is fixedly predetermined by the scaffold structure, wherein, after the arrangement of the support in its target position and after the positioning of the image evaluation device with regard to the scaffold structure in its target placement position, the at least one optochemical detection surface of the support is wetted with the sample medium or exposed to the sample medium; and carrying out at least one measurement, by means of the image evaluation device present with regard to the scaffold structure in its target placement position, on the at least one optochemical detection surface of the support arranged in its target position and evaluating the at least one measurement by means of the image evaluation device, wherein the support is arranged in the target position with a protective film covering its at least one optochemical detection surface, characterized in that, after the arrangement of the support bearing the protective film in its target position, a calibration measurement is carried out, by means of the image evaluation device present with regard to the scaffold structure in its target placement position, on the at least one optochemical detection surface of the support arranged in its target position, the protective film is removed from the at least one optochemical detection surface of the support after the calibration measurement and the at least one exposed optochemical detection surface is wetted with the sample medium or exposed to the sample medium, and wherein the evaluation of the at least one measurement by means of the image evaluation device is effected taking into account the calibration measurement previously carried out.