Question

A person with an unknown blood group under the ABO system has suffered much blood loss in an accident and needs an immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers for blood donation without delay. What would have been the type of blood group of the donor friend?

• A. Type A
• B. Type B
• C. Type AB
• D. Type O

Answer 1

The correct option is D

Type O

The correct option is D.

Explanation of correct option:

1. The ABO blood group system is based on the presence or absence of antigens (A and B) on the RBC membranes and plasma antibodies (anti-A and anti-B).
2. Blood type ‘O’ doesn’t contain A or B antigens, but both anti-A and anti-B antibodies are present.
3. Antigens are known to evoke allergic reactions in the body.
4. A person with blood group O’ is called a ‘universal donor’ since they can donate blood to any person without the risk of agglutination.

Explanation of incorrect option:

Option A:

1. Blood type ‘A’ contains antigen A and anti-B antibody.
2. An individual with blood group ‘A’ cannot donate blood to a person with an unknown blood group. They can only donate blood to people with blood groups ‘A’ or ‘AB’.

Option B:

1. Blood type ‘B’ has antigen B and anti-A antibody.
2. A person with blood group ‘A’ cannot donate blood to a person with unknown blood group due to the risk of agglutination. They can only donate blood to people with blood groups ‘B’ or ‘AB’.

Option C:

1. Blood type ‘AB’ has both A and B antigens, but no antibodies.
2. A person with blood group ‘AB’ is called a ‘universal recipient’ since they can receive blood from any blood group. However, they can only donate blood to people with ‘AB’ blood type.

Final answer: A person with an unknown blood group under the ABO system, has suffered much blood loss in an accident and needs an immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers for blood donation without delay. The blood group of the donor friend is type O.