Question: The control circle on an Eldon card, which usually contains no antibodies or a saline solution, serves primarily to: Determine the Rhesus (D) factor of

The "control" circle on an Eldon card, which usually contains no antibodies or a saline solution, serves primarily to: Determine the Rhesus (D) factor of the blood sample. Enhance the agglutination reaction in the other test circles. Verify that any agglutination observed in other circles is due to a specific antibody-antigen reaction and not due to auto-agglutination or other issues with the blood sample itself

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