Haemolytic disease of the newborn can occur when which situation arises?
Correct answer A. An Rh-negative mother carries an Rh-positive fetus after earlier sensitisation
Explanation
An Rh-negative mother sensitised by Rh-positive fetal cells makes anti-D IgG. In a later Rh-positive pregnancy these antibodies cross the placenta and destroy fetal red cells.
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