Why is agglutination dangerous? Why donor agglutinins are not taken into account when transfusing blood in small quantities?

Why is agglutination dangerous? Why donor agglutinins are not taken into account when transfusing blood in small quantities? Why can’t large amounts of foreign blood be given?

1) as a result of sticking together erythrocytes cannot perform their function – transport of oxygen molecules
2) donor agglutinins are significantly diluted and lose the ability to agglutinate erythrocytes of the recipient
3) a large amount of donor agglutinins can lead to agglutination

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