A person with an unknown ABO blood group has | vedclass

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(C) In the $ABO$ blood grouping system,individuals with type $O$ blood are known as 'universal donors'.This is because type $O$ red blood cells lack b

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Type $O$

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(C) In the $ABO$ blood grouping system,individuals with type $O$ blood are known as 'universal donors'.This is because type $O$ red blood cells lack both $A$ and $B$ antigens on their surface,meaning they do not trigger an immune response (agglutination) when introduced into the bloodstream of a recipient with any other blood type ($A, B, AB,$ or $O$).Since the patient's blood group is unknown,donating type $O$ blood is the safest medical practice to prevent a transfusion reaction.

$A$ person with an unknown $ABO$ blood group has suffered a major accident and requires immediate blood transfusion. $A$ friend offers to donate blood and has a valid certificate of their blood group. Which blood group must the friend have to ensure safe donation to any recipient?

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