A measuring system for measuring viscoelastic characteristics of a sample liquid, in particular a blood sample, comprising: at least one interface element having access openings for access to a cartridge device; at least one shaft rotatably supported by said interface element to be rotated by drive means; at least one cartridge device fixed to said interface element for holding said sample liquid, wherein said at least one cartridge device comprises a cartridge body having at least one measurement cavity (20, 20') formed therein and having at least one probe element (22, 22') arranged in said at least one measurement cavity (20, 20') for performing a test on said sample liquid, and a cover being attached on said cartridge body, wherein said cover covers at least partially said at least one measurement cavity (20, 20') and forms a retaining element for retaining said probe element (22, 22') in a predetermined position within said at least one measurement cavity (20, 20'); and wherein said at least one cartridge device is provided with at least one reagent (21, 21') stored therein, and wherein said at least one probe element (22, 22') of said at least one cartridge device cooperates with said at least one shaft; wherein said cartridge device further comprises at least one receiving cavity (16, 16') formed therein for receiving said sample liquid; at least one reagent cavity (19, 19') for storing said at least one reagent; a ductwork (13, 13'; 14, 14'; 15, 15'; 17) connecting said cavities (16, 16'; 19, 19') and said at least one measurement cavity (20, 20'); and at least one pump means (18, 18') connected to said ductwork (13, 13'; 14, 14'; 15, 15'; 17) for transporting said sample liquid from said at least one receiving cavity (16, 16') and said at least one reagent (21, 21') from said at least one reagent cavity (19, 19') to said at least one measurement cavity (20, 20') by means of said ductwork (13, 13'; 14, 14'; 15, 15'; 17); at least one detecting means cooperating with said shaft for measuring viscoelastic characteristics of said sample liquid; and control means to control said measuring system. at least one interface element having access openings for access to a cartridge device; at least one shaft rotatably supported by said interface element to be rotated by drive means; at least one cartridge device fixed to said interface element for holding said sample liquid, wherein said at least one cartridge device comprises a cartridge body having at least one measurement cavity (20, 20') formed therein and having at least one probe element (22, 22') arranged in said at least one measurement cavity (20, 20') for performing a test on said sample liquid, and a cover being attached on said cartridge body, wherein said cover covers at least partially said at least one measurement cavity (20, 20') and forms a retaining element for retaining said probe element (22, 22') in a predetermined position within said at least one measurement cavity (20, 20'); and wherein said at least one cartridge device is provided with at least one reagent (21, 21') stored therein, and wherein said at least one probe element (22, 22') of said at least one cartridge device cooperates with said at least one shaft; wherein said cartridge device further comprises at least one receiving cavity (16, 16') formed therein for receiving said sample liquid; at least one reagent cavity (19, 19') for storing said at least one reagent; a ductwork (13, 13'; 14, 14'; 15, 15'; 17) connecting said cavities (16, 16'; 19, 19') and said at least one measurement cavity (20, 20'); and at least one pump means (18, 18') connected to said ductwork (13, 13'; 14, 14'; 15, 15'; 17) for transporting said sample liquid from said at least one receiving cavity (16, 16') and said at least one reagent (21, 21') from said at least one reagent cavity (19, 19') to said at least one measurement cavity (20, 20') by means of said ductwork (13, 13'; 14, 14'; 15, 15'; 17); at least one detecting means cooperating with said shaft for measuring viscoelastic characteristics of said sample liquid; and control means to control said measuring system.