First-trimester nuchal translucency screening for fetal aneuploidy

Area of Science:

• Medical Imaging
• Prenatal Diagnosis
• Genetics

Background:

• First-trimester ultrasonography is increasingly used for fetal aneuploidy screening.
• Nuchal translucency measurement has emerged as a key early screening marker.

Purpose of the Study:

• To review existing literature on first-trimester nuchal translucency screening for fetal aneuploidy.
• To synthesize current knowledge on the application and effectiveness of this screening method.

Main Methods:

• Comprehensive MEDLINE search (1966-1998) for English-language manuscripts on nuchal translucency screening.
• Inclusion of studies with large patient populations (>500 participants).
• Cross-referencing to identify additional relevant sources.

Main Results:

• Nuchal thickness >3 mm between 10-14 weeks' gestation is a reliable screening tool for fetal aneuploidy.
• Combined ultrasonography with maternal serum markers (free beta-hCG and PAPP-A) enhances sensitivity and specificity.
• Data on nomograms, repeatability, timing, accuracy, confounding factors, pathophysiology, associated anomalies, and implications in twin gestations are presented.

Conclusions:

• First-trimester nuchal translucency measurement is a valuable screening tool for fetal aneuploidy.
• Integration with biochemical markers significantly improves detection rates.
• Further research and data compilation are essential for optimizing screening protocols.