Antibodies (agglutinins) of the A and B red cell antigens (agglutinogens)

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2022-08-07

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Are present in fetal plasma.
Cause haemolysis of RBCs containing the A and B antigens when added to a suspension of red cells in saline
Do not normally cross the placental barrier.
Have a molecular weight in excess of 500 000
Are monovalent

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safaTerkawi

2022-08-07

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A. False They form shortly after birth, possibly in response to A and B antigens carried into the body by invading bacteria.

B. False They cause agglutination (clumping) of A, B and AB cells.

C. True Unlike Rh antibodies which have a smaller molecular size.

D. True Around 1000000.

E. False They are divalent and hence cause red cells to adhere to one another during agglutination.

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