s response to invaders) against Rh
cells, even against those of her own baby. This is called Rh
sensitization. These antibodies have the potential to cross the placenta and attack the fetus' red blood cells, which in turn can cause low blood count (anemia), congestive heart failure, and even fetal death. This is called hemolytic disease. Fortunately, Rh sensitization is preventable with a medicine called Rh immunoglobulin (RhIg, or Rhogam™.