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drawn from the mother. The Unity test uses NGS technology to look for Rh alleles (genes) in the cell free fetal DNA in the maternal bloodstream. In healthy pregnancies, at least 5% (fetal fraction) of the cell free DNA in the maternal bloodstream comes from the fetus (placenta cells shed DNA into the maternal bloodstream). This small fraction of cell free DNA from the fetus is enough to determine the fetus's Rh antigen.
*Once a woman has been found to have made anti-D (or any clinically significant antibody against fetal red cells), she

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