the invention relates to a microfluidic system for processing biological samples comprising a rotary motor ; a means for controlling said motor ; a platform coupled to the rotary motor and adapted to provide at least one particle - washing structure and one particle receiving structure for receiving washed particles ; and a detection zone for detection of particles of the sample in the particle receiving structure while the platform rotates . the invention provides a sample processing system that is both automated and prone to fewer errors than manual processing . this is accomplished using a centrifugal microfluidic platform that can process raw biological samples in order to perform high - quality bead - based immunofluorescent assays . the invention uses a simple rotary motor and custom - designed plastic disc to perform the sample preparation steps outlined above .