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Related Experiment Videos

Aneuploidy screening in the first trimester.

Kevin Spencer1

  • 1Prenatal Screening Unit, Clinical Biochemistry Department, Harold Wood Hospital, Romford, UK. kevinspencer1@aol.com

American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
|February 10, 2007
PubMed
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First trimester screening accurately detects chromosomal anomalies like Trisomy 21. Combining fetal nuchal translucency (NT) with maternal serum markers achieves over 90% detection rates.

Area of Science:

  • Maternal-fetal medicine
  • Prenatal diagnostics
  • Genetics

Background:

  • First trimester screening is crucial for identifying fetal chromosomal abnormalities.
  • Early detection allows for timely genetic counseling and management.

Purpose of the Study:

  • To review the performance of first trimester screening for chromosomal anomalies.
  • To evaluate various combinations of ultrasound and biochemical markers.

Main Methods:

  • Review of existing literature on first trimester screening protocols.
  • Analysis of detection rates for Trisomy 21, 13, and 18.
  • Assessment of combined ultrasound (nuchal translucency) and biochemical markers (free β-hCG, PAPP-A).

Main Results:

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  • Detection rates exceeding 90% are achievable for Trisomy 21, 13, and 18.
  • The combination of nuchal translucency, free β-hCG, and PAPP-A is highly effective.
  • Screening is performed between 11 + 0 and 13 + 6 weeks of gestation.

Conclusions:

  • First trimester screening using combined modalities offers high detection rates for major trisomies.
  • This approach provides valuable information for prenatal care and decision-making.