Abstract
Purpose
We investigated the disagreement between the positive cell-free fetal DNA test for trisomy 13 and the standard cytogenetic diagnosis of one case.
Methods
Cell-free fetal DNA testing was performed by massively parallel sequencing. We used conventional cytogenetic analysis to confirm the commercial cell-free fetal DNA testing. Additionally, postnatal fluorescent in situ hybridization (FISH) testing was performed on placental tissues.
Results
The cell-free fetal DNA testing result was positive for trisomy 13. G-banded analysis of amniotic fluid was normal, 46, XY. FISH testing of tissues from four quadrants of the placenta demonstrated mosaicism for trisomy 13.
Conclusions
A positive cell-free fetal DNA testing result may not be representative of the fetal karyotype because of placental mosaicism. Cytogenetic analysis should be performed when abnormal cell-free fetal DNA test results are obtained.
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Capsule Reported one challenge case to cell-free fetal DNA testing, positive for trisomy 13 but disagree with the standard cytogenetic diagnosis results because of placental mosaicism.
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Liu, XY., Zhang, HG., Wang, RX. et al. Placental mosaicism for Trisomy 13: a challenge in providing the cell-free fetal DNA testing. J Assist Reprod Genet 31, 589–594 (2014). https://doi.org/10.1007/s10815-014-0182-7
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DOI: https://doi.org/10.1007/s10815-014-0182-7