Extraction module (1), especially for blood samples, with a sample container (2) having an open end (4), an end closed (5) by a bottom (6) and a side wall (7) that extends between the open end (4) and the closed end (5) having an outer surface (9) and an inner surface (10), side wall (7) that is delimited in the area of the open end (4) by a front surface (11), and the side wall (7) and the bottom (6) define a collecting chamber (12), and the sample container (2) also has at its open end (4) delimited by the front surface ( 11) a flange (13) projecting radially from the side wall (7) and an annular apron (15), wherein the annular apron (15) is disposed at a flange end (14) of the flange (13) which it is opposite the side wall (7), and the annular apron (15) extends, starting from this flange end (14), axially towards the closed end (5), they form of the sample container (2), the flange (13) and the annular apron (15) a component in one piece and being reralized between the outer surface (9) of the side wall (7) and an annular apron surface inside (16) of the annular apron (15), oriented towards the side wall (7), an approximately tubular clearance (17) which in axial direction, in the area of the open end (4), is delimited by the flange (13 ), and with a closing device (3) having a closing cap (22) as well as a perforable septum (26), held in the closing cap (22), and the closing device (3) closes in its closing position the collecting chamber (12) of the sample container (2) in the area of its open end (4), characterized in that the closing cap (22) comprises an outer cap sleeve (23), a cap sleeve interior (24) arranged at a distance from it radially, as well as a front wall (25) that joins the two cap sleeves uchon (23, 24) radially, and because in the closed position of the closure device (3), an open front end (29) of the outer cap sleeve (23) is in contact with the transition zone between the flange (13) and the annular apron (15), and because between the open
