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Lessons learned from the implementation of non-invasive fetal RHD screening
1a Laboratory of Blood Genetics, Department of Clinical Immunology , Copenhagen University Hospital , Copenhagen , Denmark.
Noninvasive prenatal testing for fetal RhD type can now guide targeted anti-D immunoglobulin prophylaxis for RhD negative pregnant women. This approach avoids unnecessary treatment for many women, improving efficiency in preventing hemolytic disease of the fetus and newborn.
Area of Science:
- Maternal-fetal medicine
- Genetics
- Immunology
Background:
- Hemolytic disease of the fetus and newborn (HDFN) is prevented by anti-D immunoglobulin prophylaxis for RhD negative women.
- Traditionally, all RhD negative pregnant women receive prophylaxis due to unknown fetal RhD status.
Purpose of the Study:
- To evaluate the implementation and performance of fetal RHD screening using cell-free DNA.
- To assess the impact of targeted antenatal prophylaxis based on fetal RhD type.
Main Methods:
- Noninvasive prenatal testing (NIPT) analyzing cell-free fetal DNA from maternal plasma.
- Fetal RHD gene analysis to determine fetal RhD status from gestational week 10.
Main Results:
- Fetal RHD screening demonstrates high accuracy with sensitivities of 99.9% in clinical programs.
- Screening allows targeted prophylaxis, avoiding treatment in ~40% of RhD negative women carrying RhD negative fetuses.
- Early results show encouraging outcomes for fetal RHD screening and targeted prophylaxis.
Conclusions:
- Fetal RHD screening is a highly accurate and feasible method for guiding antenatal prophylaxis.
- Targeted prophylaxis based on NIPT can significantly reduce unnecessary treatments.
- Widespread implementation of fetal RHD screening is expected due to its clinical benefits.
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