A fluidic centripetal apparatus (1) for testing components of a biological material in a fluid, said fluidic centripetal device having a shape adapted to be received within a rotatable holder, said rotatable holder having a center of rotation and an outer edge. The apparatus comprising: a fluidic component layer (3) having fluidic features on at least a front face, said fluidic features including an entry channel for circulating said fluid, said entry channel (302) being coupled to a intake (5) receptacle outlet; a retention chamber (403), said retention chamber being coupled to said entry channel via said intake receptacle outlet for receiving said fluid into said retention chamber; a container wholly provided in said retention chamber and containing a liquid diluent, and a bottom component layer (4) bonded to a rear of said fluidic component layer thereby creating a fluidic network through which said fluid flows under centripetal force.