Embodiments of the invention relate to a device for transporting and preparing cellular material in a fluid for subsequent diagnostic purposes, comprising a cylinder having a fluid-tight screw-on cap and a fluid-tight base part that can be screwed off of the cylinder. The cap can be screwed onto the base part in a fluid-tight matter. The device provides for introducing cellular material to be diagnosed into a fluid in the cylinder, closing the cylinder by a cap for transport, removing the cap, introducing a filter device and concentrating the cellular material on a filter surface, after which the fluid level is at that part of the base part below the connection to the cylinder, disposing of the filtrate, removing the base part, pressing the filter surface onto an object carrier for a cell analysis, and closing the base part by the cap for further transport.