Abstract
In the management of pregnancies complicated by Rh sensitization, analysis of the amniotic fluid obtained by amniocentesis appears to be a more accurate guide in assessing the status of the fetus than either the Rh antibody titer or the pregnancy history. Intra-uterine transfusion appears to have merit as a means of sustaining the fetus until it reaches viability. This therapy also may allow deferment of termination of pregnancy beyond the time when respiratory distress is most likely to develop.