Which blood type is known as the universal donor?

NORCET 2 - 2021 (shift-1)

Applied Physiology

Easy

Appeared in: NORCET 2 - 2021 (shift-1)

Explanation

O Negative blood is considered the universal donor for packed red blood cell (RBC) transfusions.
This is because its red blood cells lack A, B, and Rh (D) antigens on their surface.
The absence of these antigens means there is a minimal risk of causing an immune response (hemolytic reaction) in recipients of any other blood type.
In emergencies where the patient's blood type is unknown, O Negative blood is the safest choice for transfusion.

Option B: AB Negative blood has both A and B antigens on its red cells. This means it can only be donated to individuals who also have AB blood (AB- or AB+), as recipients with other blood types would have antibodies that attack these antigens.
Option C: O Positive blood has the Rh (D) antigen on its red cells. If transfused into an Rh-negative person, it can trigger the production of anti-Rh antibodies, leading to a transfusion reaction on subsequent exposures.
Option D: AB Positive blood is the universal recipient for red blood cells, not the universal donor. Its red cells have A, B, and Rh antigens, making it suitable for donation only to other AB Positive individuals.

Visual 1: Diagram: A chart showing the antigens and antibodies for each blood type (A, B, AB, O) and their Rh status (+/-). This helps visualize why O- is the universal donor (no antigens) and AB+ is the universal recipient (no antibodies).
Visual 2: Infographic: A flowchart illustrating the compatibility of blood transfusions, showing which blood types can donate to and receive from others.

Clinical Relevance

Nursing practice connection: Knowing Blood group compatibility and the concept of a universal donor helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
In emergency situations where a patient's blood type is unknown and they require immediate transfusion (e.g., trauma), O Negative packed RBCs are the first choice to prevent a fatal transfusion reaction.
Nurses play a critical role in transfusion safety by verifying patient identity, checking blood product compatibility, and monitoring the patient for signs of a transfusion reaction (e.g., fever, chills, back pain, shortness of breath).
What if? If the patient needed plasma instead of red blood cells, the universal donor would be type AB (AB+ or AB-), as their plasma lacks both anti-A and anti-B antibodies, making it safe for all recipients.

How to Approach the Question

First, identify the key term in the question: 'universal donor'.
Recall the principles of the ABO and Rh blood group systems. The key is that a donor's red blood cells must not have antigens that the recipient's plasma has antibodies for.
To be 'universal', the donor's red blood cells must lack the major antigens that recipients' bodies might react to. These are the A, B, and Rh (D) antigens.
Evaluate the options based on this principle: 'O' blood lacks A and B antigens. 'Negative' blood lacks the Rh antigen.
Combine these two facts: O Negative blood lacks A, B, and Rh antigens, making it the safest option for any recipient.
Contrast this with the 'universal recipient' (AB Positive), which has all the antigens but no antibodies, allowing it to receive blood from any type.

Concept Tested & Keywords

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