Question

Why their is complications in prehnancy when blood group is o negative?

Answer 1

Human blood is divided into four blood-groups based on presence and absence of two antigens i.e. A or B. According to this two antigens the blood-groups are: A, B, AB, O.

There is also another Antigen called Rh antigen. This antigen is similar to that of Rhesus Monkey. Nearly 80% of humans have this antigen. If a individual has this antigen, such individual is called Rh positive (Rh +ve) and those who does not have is called Rh negative (Rh -ve).

So, due to this Rh antigen presence in human blood, blood-groups are again divided into positive or negative i.e. A+, A-, B+, B-, AB+, AB-, O+ and O-. So, those blood-groups are divided into positive who have Rh antigen and negative who do not have Rh antigen.

A special case is found that Rh +ve and Rh -ve will form specific antibodies against each other. And, a mother with Rh +ve blood have a foetus with Rh -ve blood can be fatal as Mpthers blood can destroy the RBCs present in the baby's blood which can lead to severe anaemia, jaumdice or even destuction of the foetus. This condition is called erythroblastosis foetalis.

Answer 2

Answer:

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• During a pregnancy, Rh antibodies made in a woman's body can cross the placenta and attack the Rh factor on fetal blood cells. This can cause a serious type of anemia in the fetus in which red blood cells are destroyed faster than the body can replace them.