After Completing an Antibody Screen Using the Gel Testing Method

Multiple Choice

After completing an antibody screen using the gel testing method, results after centrifugation yield a pellet of unagglutinated cells at the bottom of the microtube and a thin layer of cells at the top gel column. This situation commonly indicates:

A) a cold agglutinin.
B) a warm autoantibody.
C) that fibrin from serum that has not clotted completely.
D) a contaminated patient specimen.