Noninvasive fetal RHD genotyping to guide targeted anti-D prophylaxis–an external quality assessment workshop

Research output: Contribution to journalJournal articlepeer-review

Documents

  • vox.12768

    Accepted author manuscript, 275 KB, PDF document

  • The Noninvasive Fetal RHD Genotyping EQA2017 Working Group

Background and Objectives: Fetal RHD genotyping of cell-free fetal DNA from RhD-negative pregnant women can be used to guide targeted antenatal and postnatal anti-D prophylaxis for the prevention of RhD immunization. To assure the quality of clinical testing, we conducted an external quality assessment workshop with the participation of 28 laboratories. Materials and Methods: Aliquots of pooled maternal plasma were sent to each laboratory. One sample was positive, and the second sample was negative for fetal RHD, verified by pre-workshop testing using quantitative real-time PCR (qPCR) analysis of RHD exons 4, 5, 7 and 10. Plasma samples were shipped at room temperature. A reporting scheme was supplied for data collection, including questions regarding the methodological setup, results and clinical recommendations. Different methodological approaches were used, all employing qPCR with a total of eight different combinations of RHD exon targets. The samples were tested blindly. Results: Fetal RHD genotyping was performed with no false-negative and no false-positive results. One inconclusive result was reported for the RHD-positive sample, and four inconclusive results were reported for the RHD-negative sample. All clinical conclusions were satisfactory. Conclusion: This external quality assessment workshop demonstrates that despite the different approaches taken to perform the clinical assays, fetal RHD genotyping is a reliable laboratory assay to guide targeted use of Rh prophylaxis in a clinical setting.

Original languageEnglish
JournalVox Sanguinis
Volume114
Issue number4
Pages (from-to)386-393
Number of pages8
ISSN0042-9007
DOIs
Publication statusPublished - 2019

    Research areas

  • cell-free fetal DNA, external quality assessment, fetal RHD genotyping, Rh prophylaxis

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