What is included in first-semester prenatal screening of Down syndrome?

Updated: Apr 30, 2018
  • Author: Gratias Tom Mundakel, MBBS, DCH; Chief Editor: Maria Descartes, MD  more...
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For pregnant women, for whom an early diagnosis is important, a first-trimester "combined test" performed at 11-14 weeks involving sonographic testing for NT together with testing for PAPP-A and hCG provides a detection rate of 82-87% for Down syndrome.

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