Patent ID: 8586376

Claim:
A method for producing an analysis element spreading layer, which is implemented for absorbing a liquid to be analyzed in an analysis element and distributing it uniformly over a liquid outlet side of the analysis element spreading layer, the method comprising the following steps: supplying a porous starting membrane having a top side, a bottom side and a starting thickness D between the bottom side and the top side, the size of the pores of the starting membrane increasing at least sectionally over its starting thickness D, selecting a predefined distance within the starting thickness D of the starting membrane parallel to the top side of the starting membrane corresponding with a desired mean pore size; cutting the starting membrane at the predefined distance in such a manner that a sublayer of the starting membrane is removed, wherein the analysis element spreading layer is a sublayer of the starting membrane, having a thickness d that is less than the starting thickness D of the starting membrane, the pores of the analysis element spreading layer are in fluid connection to one another in such a manner that the analysis element spreading layer is permeable to a liquid, the membrane surface formed by the removal of a sublayer of the starting membrane is the liquid outlet side of the analysis element spreading layer, and the mean pore size of the pores on the liquid outlet side of the analysis element spreading layer is at least 1μm and supplying the analysis element spreading layer formed to a test field having a reaction layer with at least one reagent, which is part of a reagent system for detecting an analyte in the liquid sample.