What does the risk mean?

 Chance of an
affected Pregnancy 

 Chance of an
unaffected pregnancy

1 in 4

25%

3 in 4

75%

1 in 5

20%

4 in 5

80%

1 in 10

10%

9 in 10

90%

1 in 20

5%

19 in 20

95%

1 in 30

3%

29 in 30

97%

1 in 50

2%

49 in 50

98%

1 in 100

1%

99 in 100

99%

1 in 200

0.5%

199 in 200

99.5%

Other Test Information