The invention relates to a device for detecting one or several analytes in a sample, characterized in that it comprises one or more reaction chambers and/or one or more reagent application channels, and one or more capillary systems and one or more negative vessels. The invention also relates to a method for detecting one or more analytes in a sample fluid by visualization of agglutination, characterized in that a) the sample fluid is brought into contact with a reagent, b) the reaction mixture is exposed to the effects of gravitation or magnetism, wherein the reaction mixture is strained through the capillary system of the inventive device with a negative vessel connected to the inventive device, and c) the reaction between the analyte and the reagent is determined. The invention also relates to one such method wherein the reaction mixture is brought into contact with another reagent during step b). The invention further relates to a method wherein the order of the individual steps consisting of a) and b) are reversed, particularly when the sample fluid is brought into contact with a reagent only during the effects of gravitation or magnetism.