With a Positive DAT (with IgG specificity) and reactive screen cells and autocontrol, the presence of a warm autoantibody becomes more apparent. Antibody identification testing is performed to see if a pattern of reactivity is present. The results (shown below) indicate an apparent autoantibody, but it is impossible from this testing to assess if there are also one or more alloantibodies present. What procedure should be performed at this point to determine if this is autoantibody, alloantibody, or a combination of auto- and alloantibodies?
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