The present invention relates to a device for performing an immunoassay, the device including a) a support, b) a porous matrix, fixed on the support, the matrix including (i) a liquid sample application area, (ii) a labeling area and (iii) at least one reaction area which includes a test results display area and a verification area, said liquid sample application area labeling area and reaction area being in fluid communication; the device including, at the verification area, at least a part of the porous matrix has pores with dimensions smaller than those of the labeled particles, such that at least a proportion of the labeled particles from the labeling area is stopped at said verification area forming a symbol which is visible or displayable for a user; and a method for manufacturing the device.