QuestionSBA
QuestionChoice
Group O blood can be universally donated, so is the most appropriate choice for a patient with an unknown blood group. Group O blood does not contain any A or B antigens on its surface, and therefore no circulating antibodies, which prevents an immune reaction from occurring.
10007541
a
Group O
QuestionChoice
We cannot give this patient group B blood as we do not know this patient’s blood group. The only blood group that he can receive is group O blood. This is because group O blood does not contain any A or B antigens or antibodies, and therefore whatever blood group this patent happens to be, we know there will be no transfusion reaction. By contrast, Group B blood has B antigens on the red blood cell surface and anti-A antibodies in the plasma.
10007544
d
Group B
QuestionChoice
We haven’t been told this patient’s blood group. Therefore, the only blood group that can be donated to them is group O blood. Group O blood does not contain any A or B antigens or antibodies, so will not react with any blood groups. By contrast, Group A blood has A antigens on the red blood cell surface and anti-B antibodies in the plasma.
10007542
b
Group A
QuestionChoice
We cannot transfuse group AB blood as we do not know this patient’s blood group. Therefore, the only blood group we are able to donate at this point will be group O blood.
10007543
c
Group AB
QuestionChoice
We can only donate group O blood to this patient. This is because group O blood does not contain any A or B antigens and therefore it is the only blood group that can be universally donated. If this patient had group B blood and we gave them group A blood, their anti- A antibodies will attack the group A cells.
10007545
e
Group A and O
Concept
Chapter
2693
3796
Blood group compatibility
Topic
157
Haematology
14055
A 21-year-old male requires an emergency blood transfusion after arriving in the emergency department following a road traffic collision. He has never received a blood transfusion before, and his blood group is unknown.

Which of the following blood types can he receive?
a