FRCPath Haem Part 1 MCQ-Transfusion 304

A 28yr-old woman is typed as O on routine forward grouping. Her reverse grouping reacts strongly with O, A, and B cells. DAT is neg. Which is most likely cause?

• Technical error in forward typing
• Weak D antigen
• Autoimmune haemolysis
• Bombay (Oh) phenotype

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