Question

Erythroblastosis foetalis happens when mother is Rh ___ and the foetus is Rh ____.

• A. –ve, +ve
• B. –ve, –ve
• C. +ve, +ve
• D. +ve, –ve

Answer 1

The correct option is A –ve, +ve

Erythroblastosis foetalis is a condition that arises due to the incompatible blood group of mother and growing foetus.

If mother is Rh -ve and carries a Rh+ve foetus, at the time of child birth, when umbilical cord is cut, Rh antigens from foetus enter the mother and she gets sensitized and starts producing Rh antibodies.The first Rh +ve child is born safe.

But if the women carries Rh+ve foetus second time, the Rh antibodies from mother enter the foetus via placenta and lead to the death of the foetus due to agglutination reaction.