Case B3: ABO Discrepancy Complicated by Transfusion

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Last Updated: Oct. 28, 2016 [All links fixed]

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Case Report


Mr. VT is a 50-year-old male who has been admitted for elective surgery following a car accident. He had been admitted to another hospital 4 weeks earlier following the accident.


  • Two units of red cells are ordered for the surgery.
  • Results

Discussion and Resolution


After reviewing the case resolution, answer these questions:

  1. What percentage of group A subgroups have anti-A1 present?


  2. Is the anti-A1 present in some A subgroups usually clinically significant?


  3. What is the typical appearance of mixed-field agglutination?


  4. What can cause mixed-field agglutination?


Further Reading