during plasma separation can be avoided despite an accelerated procedure the device comprises a disposable unit in which the device is characterized by an economical and simple method of production application_number US 14117608 A description referring initially to fig1 an example of the construction of a separation element 1 in accordance with one embodiment of the present invention is illustrated the separation element 1 comprises a transport fleece 2 which for example consists of glass fibers a separation fleece 3 which is composed of a filter medium is mounted on the transport fleece 2 the main difference between the transport and the separation fleece is their different densities in the prior art a density of 77 g cm 2 is for example given for a separation fleece and 53 g cm 2 for a transport fleece whatman fleece the smaller thickness of the transport fleece allows a rapid transport of the sample along the fleece whereas the larger thickness of the separation fleece ensures a reliable separation of plasma from blood when a blood drop 5 is applied the blood enters the separation fleece 3 the filter medium in the separation fleece separates the blood components from the plasma and retains them.