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

1. Type B
2. Type AB
3. Type O
4. Type A

Correct answer: Type O

Solution

Type O red blood cells do not carry A or B antigens, so they are least likely to be attacked by the recipient’s antibodies when the recipient’s ABO type is unknown. That makes Type O the safest immediate donor choice in this situation.

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