Rapid prenatal diagnostics in the interphase nucleus: procedure and cut-off rates

Area of Science:

• Prenatal Diagnostics
• Cytogenetics
• Molecular Biology

Background:

• Rapid prenatal screening for aneuploidy is crucial for timely genetic counseling.
• Fluorescence in situ hybridization (FISH) offers a rapid method for detecting chromosomal abnormalities in uncultured amniocytes.
• Potential pitfalls exist in probe set usage and result interpretation.

Purpose of the Study:

• To evaluate the reliability and safety of the Aneu Vysion kit for rapid prenatal aneuploidy screening.
• To establish cut-off rates and handling procedures for the Aneu Vysion kit based on extensive case experience.
• To assess the diagnostic accuracy and potential risks associated with FISH-based prenatal aneuploidy screening.

Main Methods:

• Utilized the Aneu Vysion kit (ABBOTT/Vysis) for fluorescence in situ hybridization (FISH) analysis.
• Analyzed uncultured amniocytes for common aneuploidies.
• Established specific cut-off rates and interpretation guidelines based on 1200 studied cases.
• Compared FISH results with subsequent full chromosome analysis.

Main Results:

• The FISH-based rapid prenatal aneuploidy screening demonstrated high reliability.
• The overall risk for misdiagnosis was found to be low, approximately 0.4%.
• Established cut-off rates and handling procedures enhance the accuracy of the Aneu Vysion kit.

Conclusions:

• Rapid prenatal aneuploidy screening using FISH in uncultured amniocytes is a reliable diagnostic tool.
• The Aneu Vysion kit, when used with established protocols, provides accurate results with a low misdiagnosis rate.
• FISH screening should be employed as a preliminary test preceding comprehensive chromosome analysis via microscopy.