An auto control should be included when resolving reverse typing discrepancies that may be caused by autoantibodies.
Auto control = patient plasma + patient red cells
An O cell control should be included when resolving reverse typing discrepancies that may be caused by alloantibodies. Antibody screening cells are group O, so performing an antibody screen is the same thing as completing an O control.
O control= patient plasma + reagent O cells (screen cell II)
