A method of determining a final numerical analyte result value corresponding to a concentration of an analyte in a bodily fluid using a mobile device having a processing device, and a display device comprising the steps of: - determining by the processing device an initial numerical analyte result value from an image of a color formation of a reagent test region; - displaying a final numerical analyte result value and/or an analyte value range of a group of preset analyte value ranges corresponding to the final numerical analyte result value and/or a message corresponding to the corresponding analyte value range; - wherein the final numerical analyte result value is determined by - comparing the initial numerical analyte result value to at least one upper threshold value and to at least one lower threshold value and - adding a preset upper bias to the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value exceeds the upper threshold value, or - subtracting a preset lower bias from the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value falls below the lower threshold value, or - using the unchanged initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value does neither exceed the upper threshold value nor fall below the lower threshold value. - determining by the processing device an initial numerical analyte result value from an image of a color formation of a reagent test region; - displaying a final numerical analyte result value and/or an analyte value range of a group of preset analyte value ranges corresponding to the final numerical analyte result value and/or a message corresponding to the corresponding analyte value range; - wherein the final numerical analyte result value is determined by - comparing the initial numerical analyte result value to at least one upper threshold value and to at least one lower threshold value and - adding a preset upper bias to the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value exceeds the upper threshold value, or - subtracting a preset lower bias from the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value falls below the lower threshold value, or - using the unchanged initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value does neither exceed the upper threshold value nor fall below the lower threshold value. - comparing the initial numerical analyte result value to at least one upper threshold value and to at least one lower threshold value and - adding a preset upper bias to the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value exceeds the upper threshold value, or - subtracting a preset lower bias from the initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value falls below the lower threshold value, or - using the unchanged initial numerical analyte result value to form the final numerical analyte result value if the initial numerical analyte result value does neither exceed the upper threshold value nor fall below the lower threshold value.