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Human Reproduction, Vol 13, 1472-1475, Copyright © 1998 by Oxford University Press

ARTICLES

Obstetric outcome after RhD and Kell testing

S Lipitz, A Many, S Mitrani-Rosenbaum, H Carp, Y Frenkel and R Achiron
Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Tel Hashomer, Israel.

The study was conducted to report on the use of molecular biology methods and pregnancy outcome in women sensitized to either Rhesus D (RhD) or Kell 1 (K1) antigens. Paternal RhD genotype was determined by DNA amplification of an RhD-specific sequence from single sperm cells. Paternal Kell phenotype was determined by serologic assays using peripheral blood samples, and the fetal RhD or Kell-type status were established by the polymerase chain reaction (PCR) with amniotic cells. Thirteen women (14 pregnancies, one with twins) sensitized to RhD and four sensitized to K1 antigens, comprised the study group. All had paternal heterozygosity to either D or K1 antigens. Nine fetuses were RhD positive and five were RhD negative. An additional woman underwent early spontaneous abortion. The nine RhD-positive fetuses underwent a total of 41 invasive procedures. One fetus with hydrops fetalis died in utero after intrauterine blood transfusion. All the remaining RhD- positive fetuses were delivered after 33 weeks gestation, and all those who were RhD negative were delivered at term. Four women were sensitized to the K1 antigen; in three, the fetus was found to be K1 negative, and in one, K1 positive, necessitating intrauterine blood transfusion. In all cases, the results of RhD or K1 genotype analyses from amniotic fluid were compatible with fetal/neonatal red blood cell RhD or Kell phenotypes. In conclusion, the use of molecular biology techniques represents a major advance in the clinical management of RhD and Kell alloimmunization.
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