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Table 2 Sequencing results for six placental biopsies

From: A case of placental trisomy 18 mosaicism causing a false negative NIPT result

Sample Chromosome 18
Z scores
Chromosome 18 ratio Speculated chimeric proportion of T18
maternal side 1 40.279 3.327% 33%
2 40.066 3.322% 33%
3 49.474 3.427% 40%
fetal side 4 48.311 3.420% 39%
5 89.007 3.884% 72%
6 44.263 3.370% 36%
Control −2.58944 2.856% /
  1. Six placental biopsies (three from the maternal side, 1–3; three from the fetal side, 4–6) were taken for routine cytogenetics at 35GA