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Table 1 Spectral Karyotype Findings in 31 Prenatal Cases and 148 Postnatal Cases with Abnormal Karyotypes

From: Spectral Karyotyping for identification of constitutional chromosomal abnormalities at a national reference laboratory

Cytogenetic (GTG-banded) Abnormality

Spectral Karyotype Findings

 

Positive, n

Inconclusive, n

Approximate Sensitivity, %

Supernumerary Marker

   

   Prenatal (n = 13)

10

3

77

   Postnatal (n = 62)

48

14

77

Additonal genetic material

   

   Prenatal (n = 6)

5

1

83

   Postnatal (n = 65)

63

2

97

Ring chromosome

   

   Prenatal (n = 4)

4

0

100

   Postnatal (n = 9)

9

0

100

Complex rearrangements

   

   Prenatal (n = 8)

7

1

88

   Postnatal (n = 12)

12

0

100

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Total

   

   Prenatal (N = 31)

26

5

84

   Postnatal (N = 148)

132

16

89