Doppler ultrasonographic evaluation of twins discordant for Rh alloimmunization

Minimally invasive methods have been used successfully to diagnose and treat maternal red blood cell alloimmunization. We present a case of a dizygotic twin pregnancy discordant for the Rh allele. Serial Doppler ultrasonography helped to diagnose the fetus that was at-risk for anemia caused by Rh alloimmunization and to direct treatment. (Am J Obstet Gynecol 2002;187:250-1.)