A Blood Bank Technologist Needed to Confirm the Presence of Anti-P₁

question 47

Multiple Choice

A blood bank technologist needed to confirm the presence of anti-P₁ in a patient specimen. Fresh cells were not available for use, so an old panel that contained cells positive for P₁ was used. No cells positive for the antigen reacted at any phase of the antiglobulin test, whereas cells from the screening cells showed specificity for the presence of anti-P₁. What is a possible explanation for this?

• A) Technician omitted LISS
• B) Patient expresses the p phenotype
• C) P₁ antigen deteriorates rapidly upon storage
• D) Technician forgot to add AHG

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