Which of the Following Describes a Cold Autologous Absorption Procedure

Which of the following describes a cold autologous absorption procedure?

A) An aliquot of patient cells is incubated with an equal aliquot of patient serum at 37°C; autoantibody is removed and alloantibody remains in the serum.
B) An aliquot of patient cells is incubated with an equal aliquot of patient serum at 37°C; alloantibody is removed while autoantibody remains in the serum.
C) An aliquot of patient cells is incubated with an equal aliquot of patient serum at 4°C; alloantibody is removed while autoantibody remains in the serum.
D) An aliquot of patient cells is incubated with an equal aliquot of patient serum at 4°C; autoantibody is removed while alloantibody remains in the serum.