Trisomy 18 risk: A result of 1:1300 indicates that in 1300 pregnancies with the exact same test results, only one of them will result in a child with trisomy 18. This is approximately a 0.08% chance of trisomy 18. This result gives a higher chance than the best risk group (less than 1:10, 000) but still reflects a low likelihood of trisomy 18.
Answered 6/11/2016
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