PubMed · 3746246
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R V Lenth. On identification by probability.. https://doi.org/10.1016/s0015-7368(86)72477-8
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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.
The present study evaluates the usefulness of a PCR-based method for routine paternity testing in 35 paternity cases. This identification method which is based on amplification of three hypervariable genetic loci, apoB, D1S80 and HLA-DQ alpha, is compared, with regard to reliability and technical feasibility, to the conventional identification methods based on protein polymorphisms and to Southern blot hybridizations with multi- and single locus probes. Data obtained by PCR-amplification of these three loci resulted in paternity indices (56.1, geometric mean value) which are at the same level as the corresponding values derived from standard genetic blood group markers (42.7). The geometric mean value of the paternity indices obtained by Southern blot hybridization using three single locus probes (190.6) was more informative, and the most informative analysis proved to be Southern blot hybridization with multilocus probes. The technical feasibility and the reproducibility of the PCR-based analysis is, however, overwhelming, and if several highly polymorphic loci are amplified, the resolving power of PCR-analysis is similar to that obtained using multilocus probes.