An in-vitro diagnostics system arranged is presented. The system comprises a track, carriers to carry samples with data carriers, and a control station comprising a camera to detect sample images, a data carrier reader, a relocation device to relocate the sample, and a controller. The data carrier reader reads the data carrier through a read-out window. Measurement data indicates data carrier characteristics on a sample in a starting position determined from the camera images. Obscuring data indicates obscuring of part of the data carrier when the images are detected in the starting position. The controller determines, from the measurement data and the obscuring data, characteristics of the data carrier comprising location and size of the data carrier. Based on the data carrier characteristics, the sample is relocated relative to the read-out window from the starting position into a read-out position optimizing visibility of the data carrier through the read-out window.