Which blood group can be used in an emergency or when the desired blood group is not available?

AIIMS Delhi NO - 2017

Medical Surgical Nursing

Easy

Appeared in: AIIMS Delhi NO - 2017

Explanation

Blood group O is referred to as the universal donor.
This is because its red blood cells (RBCs) do not have A or B antigens on their surface.
The absence of these antigens prevents the recipient's immune system from launching an attack (hemolytic reaction) against the transfused blood.
In emergency situations where the patient's blood type is unknown, transfusing Group O blood is the safest option to avoid a life-threatening incompatibility reaction.
Specifically, O-negative blood is the ideal universal donor as it also lacks the RhD antigen, making it compatible with both Rh-positive and Rh-negative recipients.

Option A: Blood group B has B antigens on its red blood cells and anti-A antibodies in the plasma. It cannot be given to patients with blood type A or O, as their antibodies would attack the transfused cells.
Option B: Blood group AB has both A and B antigens on its red blood cells and no anti-A or anti-B antibodies. It is known as the 'universal recipient,' not the universal donor, because a person with this blood type can receive red blood cells from any ABO group.
Option C: Blood group A has A antigens on its red blood cells and anti-B antibodies in the plasma. It cannot be given to patients with blood type B or O.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Universal Blood Donor Principle in acute care settings.
In emergency medicine, particularly in trauma cases with massive blood loss, O-negative blood is transfused immediately when there is no time to type and crossmatch the patient's blood.
Nurses have a critical patient safety role in blood transfusions. This includes the 'two-person verification' process, where two qualified healthcare professionals must independently confirm the patient's identity and the compatibility of the blood product before administration.
What if? If a patient is known to be Rh-positive (e.g., A+) and O-negative blood is in short supply, O-positive blood can be used as a universal donor in an emergency for male or post-menopausal female patients. However, it should be avoided in females of childbearing age to prevent Rh sensitization.

How to Approach the Question

First, identify the key terms in the question: 'emergency' and 'desired blood group not available'. These terms point to the need for a universally compatible blood type.
Recall the fundamental principles of the ABO blood group system, specifically the concepts of antigens on red blood cells and antibodies in the plasma.
Remember the definition of a 'universal donor': a blood group that lacks the major antigens (A and B) and can therefore be given to any recipient without causing a major immune reaction.
Evaluate the options based on this definition. Group A has A antigens, Group B has B antigens, and Group AB has both. Only Group O lacks both A and B antigens.
Conclude that Group O is the universal donor and the correct answer for emergency situations.

Concept Tested & Keywords

Concept Tested: Universal Blood Donor Principle
Stem keywords: blood group, emergency, not available
Lead-in keywords: Which
Clinical cues: The care setting changes urgency, monitoring level, and the expected nursing action.

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