Chorionic villus sampling for fetal Rh typing: clinical implications.

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T S Kickler; K Blakemore; R S Shirey; S Nicol; N Callan; P M Ness; C Escallon; G Dover (Profiled Authors: Paul Ness; Karin Blakemore; George Dover; Thomas Kickler)

Department of Laboratory Medicine, Johns Hopkins University School of Medicine, Baltimore, MD.
American journal of obstetrics and gynecology 1992;166(5):1407-11.

PubMed

Abstract

OBJECTIVE: The prenatal Rh typing of red blood cells obtained by chorionic villus sampling was performed with an immune rosette technique. STUDY DESIGN: Ten Rh-negative pregnant women undergoing chorionic villus sampling at 9 to 11 weeks' gestation were studied at a large referral hospital. RESULTS: Accurate Rh phenotyping may be done on red blood cells obtained from chorionic villi weighing 2 to 8 mg. The preparations were shown to be greater than 90% fetal in origin as demonstrated by radial immunodiffusion quantitation of fetal hemoglobin-containing cells. Of the 10 fetuses typed in the first trimester nine of the pregnancies were carried to term. In all cases typing of red blood cells confirmed the antenatal fetal red cell typing. CONCLUSIONS: This study shows that antenatal Rh phenotyping may be performed as early as 9 to 11 weeks' gestation. This technique may be used in the management of pregnancies complicated by Rh incompatibility.

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