Invasive genetic diagnosis in multiple pregnancies.

Area of Science:

• Perinatology
• Medical Genetics
• Obstetrics

Background:

• Multiple gestations exhibit a higher incidence of chromosomal anomalies and mendelian diseases compared to singleton pregnancies.
• Prenatal diagnosis is therefore a critical consideration in multiple pregnancies, especially when specific indications arise.

Purpose of the Study:

• To highlight the importance and safety of invasive prenatal diagnostic procedures in multiple pregnancies.
• To compare the advantages of chorionic villus sampling (CVS) over amniocentesis for early pregnancy assessment.

Main Methods:

• Review of invasive prenatal testing techniques, specifically amniocentesis and chorionic villus sampling (CVS).
• Emphasis on the timing, safety, and diagnostic capabilities of CVS in early pregnancy.
• Discussion of the necessity for specialized centers and experienced personnel.

Main Results:

• Invasive testing, including amniocentesis and CVS, can be performed safely in multiple pregnancies.
• Chorionic villus sampling provides rapid karyotyping, biochemical, and DNA analysis earlier in gestation than amniocentesis.
• Discordant results require specialized expertise for accurate interpretation and management.

Conclusions:

• Prenatal diagnosis is recommended for multiple pregnancies when indicated, with invasive procedures being a safe option.
• Chorionic villus sampling offers significant advantages for early and comprehensive prenatal genetic evaluation in multiple gestations.
• The performance of these complex procedures should be limited to experienced centers to ensure optimal patient safety and diagnostic accuracy.