Abstract: This invention relates to a method, a system and a service for analyzing biological liquids like blood and to assess the quality of such liquid. The analysis is made on a plurality of dried drops of the liquid as samples on a substrate, and involves scanning the substrate to create an image of the dried samples on the substrate. The image of the samples is processed in order to segment and qualify the samples into images of defined sample drops for further processing, whereafter they are grouped into at least one group of samples. The samples are analyzed to retrieve the total areas having at least one predetermined color and to retrieve the total areas for each predetermined color in the drops, whereby a ratio is calculated of the total area of the defined sample drops versus the total areas of the at least one predetermined color areas to achieve a quality indication of the liquid.