Final answer:
For severe anemia in a fetus caused by Rh alloimmunization, the standard treatment is an intrauterine fetal blood transfusion with Rh-negative blood to manage the anemia.
Step-by-step explanation:
The intervention for a fetus shown to have severe anemia from Rh alloimmunization is a fetal blood transfusion. Rh alloimmunization, also known as hemolytic disease of the newborn (HDN) or erythroblastosis fetalis, occurs when an Rh-negative mother produces anti-Rh antibodies that cross the placenta and attack the Rh-positive red blood cells of the fetus. This immune response can cause severe anemia in the fetus. Treatment with intravenous immunoglobulin (IVIG) or maternal plasma exchange is not the standard approach.
Early induction of labor is an option in certain situations, but only if the fetus is at a viable stage of gestation and the anemia is life-threatening. The primary intervention for severe fetal anemia due to Rh alloimmunization is an intrauterine transfusion where Rh-negative blood is transfused directly to the fetus.