Question

If a women becomes pregnant second time, the foetus is in danger when

• A. Mother is Rh (+) ve and foetus is Rh (-) ve
• B. Mother is Rh (-) ve and foetus is Rh (+) ve
• C. Father is Rh (-) ve and foetus is Rh (+) ve
• D. Father is Rh (+) ve and foetus is Rh (-) ve.

Answer 1

Answer: (B)

Mother is Rh (-) ve and foetus is Rh (+) ve

If the mother is Rh-negative, her immune system treats Rh-positive fetal cells as if they were a foreign substance. The mother's body makes antibodies against the fetal blood cells. Her antibodies can cross the placenta and attack the baby's red blood cells. This causes hemolytic disease due to Rh incompatibility. It is an anemia that can cause serious complications in the infant, including brain damage and even death.

So, the correct answer is 'Mother is Rh (-) ve and foetus is Rh (+) ve'