Case Report
False Negative Cell-Free DNA Screening Result in a Newborn with Trisomy 13
Table 1
Summary of tissue specific trisomy 13 mosaicism.
| Tissue type | # of nuclei with disomy 13 | # of nuclei with trisomy 13 | # of total nuclei | % of nuclei with trisomy 13 |
| Umbilical cord | 21 | 29 | 50 | 58% | Amnion | 18 | 24 | 42 | 57% | Intermediate trophoblast | 26 | 46 | 72 | 64% | Villous trophoblast | 28 | 13 | 41 | 32% | Villous stroma | 23 | 20 | 43 | 46% |
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