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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