A Blood Sample from a 90-Year-Old Man Was Submitted to the Blood

question 4

Multiple Choice

A blood sample from a 90-year-old man was submitted to the blood bank for a type and screen before surgery.The forward type demonstrates as a group A,whereas the reverse type appears to be group AB.What is the most likely cause of the discrepancy?

• A) Contaminated reagent antisera
• B) Rouleaux formation
• C) That the patient has autoantibodies
• D) That patient has low-titer isoagglutinins

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