Arrangement (100) evaluating performance of milk dosing arrangement (105)/lateral flow stick (110). The arrangement (100) comprises: the lateral flow stick (110) arranged to indicate a biomarker in a milk sample. The lateral flow stick (110) comprises sample pad (210), conjugate pad (230), indication zone (250) and porous membrane (240). The milk sample is applied to the sample pad (210). A camera (120) is directed to capture an image (300) of the lateral flow stick (110). A controller (130) is configured to instruct the camera (120), to capture the image (300); receive the captured image (300); define a first area (310) of the image (300) of the lateral flow stick (110), substantially depicting a subsection of the porous membrane (240) upstream the indication zone (250) in the flow direction; apply image processing on the first area (310); evaluate performance of the milk dosing arrangement (105) based on the image processing.