A fluidic centripetal device 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, said fluidic centripetal device extending radially between said center of rotation and said outer edge, an inner side of said fluidic centripetal device being located towards said center of rotation and an outer side of said fluidic centripetal device being located towards said outer edge, the device comprising: a fluidic component layer having fluidic features on at least a front face, said fluidic features including an entry channel for circulating said fluid, said entry channel being coupled to a chamber inlet; a bottom-fillable chamber coupled to said entry channel at said chamber inlet for receiving said fluid, said chamber inlet being provided at an outer side of said bottom-fillable chamber, wherein said bottom-fillable chamber comprises at least one translocatable member that translocates within said bottom-fillable chamber in response to an external fluctuating magnetic field, the geometry of the chamber inlet being adapted to prevent exits of the translocatable member from the bottom-fillable chamber, said entry channel circulating said fluid from near said inner side to said chamber inlet; a surplus outlet; an overflow chamber coupled to said surplus outlet for said bottom-fillable chamber, said surplus outlet allowing exit of part of said fluid from said bottom-fillable chamber to said overflow chamber, wherein said surplus outlet is provided near said inner side of said bottom-fillable chamber on a longitudinal side of said bottom-fillable chamber; a vent channel simultaneously venting said bottom-fillable chamber and said overflow chamber; and a bottom component layer bonded to said fluidic component layer thereby creating a fluidic network through which said fluid flows under centripetal force. a fluidic component layer having fluidic features on at least a front face, said fluidic features including an entry channel for circulating said fluid, said entry channel being coupled to a chamber inlet; a bottom-fillable chamber coupled to said entry channel at said chamber inlet for receiving said fluid, said chamber inlet being provided at an outer side of said bottom-fillable chamber, wherein said bottom-fillable chamber comprises at least one translocatable member that translocates within said bottom-fillable chamber in response to an external fluctuating magnetic field, the geometry of the chamber inlet being adapted to prevent exits of the translocatable member from the bottom-fillable chamber, said entry channel circulating said fluid from near said inner side to said chamber inlet; a surplus outlet; an overflow chamber coupled to said surplus outlet for said bottom-fillable chamber, said surplus outlet allowing exit of part of said fluid from said bottom-fillable chamber to said overflow chamber, wherein said surplus outlet is provided near said inner side of said bottom-fillable chamber on a longitudinal side of said bottom-fillable chamber; a vent channel simultaneously venting said bottom-fillable chamber and said overflow chamber; and an entry channel for circulating said fluid, said entry channel being coupled to a chamber inlet; a bottom-fillable chamber coupled to said entry channel at said chamber inlet for receiving said fluid, said chamber inlet being provided at an outer side of said bottom-fillable chamber, wherein said bottom-fillable chamber comprises at least one translocatable member that translocates within said bottom-fillable chamber in response to an external fluctuating magnetic field, the geometry of the chamber inlet being adapted to prevent exits of the translocatable member from the bottom-fillable chamber, said entry channel circulating said fluid from near said inner side to said chamber inlet; a surplus outlet; an overflow chamber coupled to said surplus outlet for said bottom-fillable chamber, said surplus outlet allowing exit of part of said fluid from said bottom-fillable chamber to said overflow chamber, wherein said surplus outlet is provided near said inner side of said bottom-fillable chamber on a longitudinal side of said bottom-fillable chamber; a vent channel simultaneously venting said bottom-fillable chamber and said overflow chamber; and a bottom component layer bonded to said fluidic component layer thereby creating a fluidic network through which said fluid flows under centripetal force.