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Table 2 Clinical details of the 5 cases with fetal trisomies 18 and 21

From: Performance of non-invasive prenatal testing for trisomies 21 and 18 in twin pregnancies

Placentation

Case

Maternal age

Gestational age

Conception

Fetal fraction

BMI

NIPT Result

Karyotyping

DCDA

Case 1

31

19

ART

9

25

T18

Normal/T18

Case 2

37

18

ART

7.5

22

T21

Normal/T21

Case 3

35

16

ART

21.2

23

T21

Normal/T21

Case 4

36

16

ART

30.6

22

T21

Normal/T21

MCDA

Case 5

37

16

NP

6.1

27

T21

Normal/T21

  1. DCDA Dichorionic diamniotic, MCDA Monochorionic diamniotic, ART Artificial reproductive technology, NP Natural pregnancy