Methods for preventing aggregation of detection particles in a test for detecting a multi-epitope target analyte comprising two or more similar or identical epitopes in a sample and/or for determining the concentration of the multi-epitope target analyte in a sample by applying a first capture entity which can specifically bind to at least one epitope on the multi-epitope analyte and block the at least one epitope from binding to a detection particle. The detection of the multi-epitope target analyte may further include the use of a second capture entity, which can specifically bind to the same or a similar epitope of the multi-epitope target analyte as the first capture entity. The multi-epitope target may be detected through the use of a system comprising a sensor surface and the use of a first capture entity to block the at least one epitope from binding to a detection particle.