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Reliability and clinical application of fetal RhD genotyping with two different fluorescent duplex polymerase chain
G Crombach1, D Niederacher, D Larbig
1Department of Obstetrics and Gynecology, University of Düsseldorf, Germany.
Objective:
This study was designed to evaluate accuracy and clinical usefulness of fetal RhD genotyping with fluorescent duplex polymerase chain reaction.
Study Design:
Two RhD-specific gene fragments (exon 10 in polymerase chain reaction 1 and exon 7 in polymerase chain reaction 2) were amplified in samples from 213 fetuses.
Results:
Amplification failed in 0.9% of the specimens, and equivocal results were found in 1.4% of the specimens. Of the analyses, 6.6% had to be repeated. The concordance of genotyping and serotyping was 99.0% for each polymerase chain reaction. False-positive results were noted in 4 fetuses. Concordant findings from both assays indicated the correct serotype for all fetuses. In 44 alloimmunized pregnancies, further invasive procedures were avoided for 5 of the 6 genotypically RhD-negative fetuses. Only two of 38 RhD-positive fetuses had a hemoglobin level <8 g/dL at first fetal blood sampling.
Conclusions:
Fetal genotyping at distinct regions of the RhD gene is reliable and improves the care management of sensitized women.
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