Multiple choice

Erythroblastosis foetal occurs

  1. when the mother is Rh positive and the child is Rh negative

  2. when the father and child are both negative, but the mother is positive

  3. when the mother and child are both Rh positive, but the father is Rh-negative

  4. when the mother is Rh negative and the child is Rh positive

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Erythroblastosis fetalis (hemolytic disease of the newborn) occurs when an Rh-negative mother carries an Rh-positive fetus. During delivery or placental disruption, fetal Rh-positive RBCs enter maternal circulation, triggering antibody production. In subsequent pregnancies, these antibodies attack fetal RBCs.