Detection of specific antigens in a population of antigens

Detection of the presence or absence of, RH positive cells in a mixed population with Rh negative cells, as is found in a fetal maternal hemorrhage (FMH). The novel methods utilize gravitational forces or applying magnetic forces to reactive magnetic particles to isolate, distinguish and quantify cells. Particles aggregate and are pulled or settle by gravity through a transparent separating solution into a measuring zone where the volume of Rh positive cells can be measured. Rh positive cell volume is correlated to the volume of the original blood sample as an indication of the number of doses of RhIG needed to be administered to the mother to prevent subsequent Rh immunization.