A kit for clinical analysis, including a vessel containing magnetizable particles and a magnetic stirring element. A device for distributing magnetizable particles in a fluid including a platform for supporting a vessel containing a fluid, magnetizable particles, and a magnetic stirring element, where the magnetic stirring element moves in a horizontal plane within the vessel. A method for distributing magnetizable particles in a fluid including the steps of providing a vessel containing a magnetic stirring element and a fluid containing magnetizable particles, moving the magnetic stirring element in the vessel, and distributing the magnetizable particles in the fluid.