Non-invasive prenatal testing is becoming more common and cost effective. It detects more than 99% of fetuses with Trisomy 21, and more than 95% of fetuses with Trisomy 18, Trisomy 13 or abnormalities of sex chromosomes. These are much better detection rates than we observe with conventional first trimester screening for these trisomies (85% for trisomy 21, 50% for trisomy 18, and 50% for trisomy 13)
Further reading:
https://www.racgp.org.au/afp/2014/july/noninvasive-prenatal-testing/
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