A Type-A Person Demonstrates a 3+ Reactivity with A₁ Cells

question 51

Multiple Choice

A type-A person demonstrates a 3+ reactivity with A₁ cells (reverse grouping) . The forward grouping with anti-A is 4+. Therefore, the possibility of a subgroup is excluded. B cells demonstrate a 4+ reaction. The antibody screen is weakly positive at 37°C but shows no reactivity at the AHG phase. An antibody panel is performed and anti-M is identified. The patient phenotypes negative for M antigen. How is the ABO discrepancy resolved?

• A) Perform reverse grouping at 4°C.
• B) Perform reverse grouping with A₁ cells negative for M antigen.
• C) Perform reverse grouping with A₁ cells positive for M antigen.
• D) Perform forward grouping at 4°C.

---

Definitions:

David Hume

An 18th-century Scottish philosopher, historian, economist, and essayist known for his philosophical empiricism and skepticism, as well as his contribution to the naturalist approach to philosophical questions.

Descartes

A French philosopher, mathematician, and scientist, known for his contributions to the development of modern philosophy and the Cartesian coordinate system.

Single Self

The concept of a unified, singular identity or consciousness that an individual perceives themselves as over time.

Own Mind

The individual's unique thoughts, beliefs, and cognitive processes that are independent of external influences.