Persons of AB blood group are universal acceptors because

RRB Staff Nurse Jaipur-6th June 2018

Applied Physiology

Medium

Appeared in: RRB Staff Nurse Jaipur-6th June 2018

Explanation

Individuals with AB blood group are called universal recipients because their plasma does not contain the naturally occurring anti-A or anti-B antibodies (agglutinins).
Antibodies in a recipient's plasma are what attack foreign antigens on donor red blood cells, causing a potentially fatal transfusion reaction (agglutination).
Since AB plasma has no such antibodies, it will not mount an immune attack against A, B, or O red blood cells, allowing for the safe reception of packed RBCs from all ABO types.

Option A: This statement is a definition, not an explanation. It describes what a universal acceptor is, but does not explain the underlying biological reason why they can accept blood from all groups.
Option C: This is factually incorrect. Individuals with the AB blood group are characterized by the presence of both A and B antigens on their red blood cells.
Option D: This is incorrect as blood transfusion compatibility is determined by the antigen-antibody system, not by proteins involved in the clotting cascade. Clotting and immune reactions to transfusions are separate physiological processes.

Visual 1: Diagram: The ABO blood group system, illustrating the antigens present on the surface of red blood cells and the corresponding antibodies in the plasma for types A, B, AB, and O.
Visual 2: Flowchart: Blood transfusion compatibility, showing which blood types can donate to and receive from others, highlighting Type AB as the universal recipient and Type O as the universal donor.

Clinical Relevance

Nursing practice connection: Knowing ABO Blood Group System and Transfusion Compatibility helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurate blood typing and cross-matching are critical nursing responsibilities before any blood transfusion to prevent life-threatening acute hemolytic transfusion reactions.
A hemolytic reaction occurs when the recipient's antibodies attack the donor's red blood cells, leading to symptoms like fever, chills, back pain, and potentially renal failure and shock.
What if? If a patient with AB blood is Rh-negative (AB-), they are still a universal recipient for red blood cells from all ABO groups, but they should ideally only receive Rh-negative blood to prevent Rh sensitization and a future immune reaction.

How to Approach the Question

First, identify the core of the question. It asks for the reason ('because') behind a known fact (AB group are universal acceptors).
Differentiate between a definition and a mechanism. One option defines a universal acceptor, but doesn't explain the underlying biology.
Recall the fundamental principles of the ABO system: Antigens are on the red blood cells (RBCs), and antibodies are in the plasma.
Analyze the transfusion interaction: The recipient's antibodies react with the donor's antigens. For a universal recipient to not have a reaction, they must lack the attacking antibodies.
Evaluate each option based on this principle. This logic points directly to the absence of antibodies in the plasma as the correct explanation.

Concept Tested & Keywords

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