[Clinical study on prenatal cytogenetic analysis (author's transl)]

Area of Science:

• Cytogenetics
• Prenatal Diagnosis
• Cell Culture

Context:

• Amniotic fluid analysis for karyotyping has been conducted for a decade.
• Clinical applications require improved culture conditions and specimen processing.
• Demographic factors like advanced maternal age and previous Down's syndrome history influence testing decisions.

Purpose:

• To enhance culture conditions for amniotic fluid cell analysis.
• To improve the clinical applicability of prenatal karyotyping.
• To optimize specimen handling for better metaphase spread quality.

Summary:

• Direct inoculation of specimens (19+ weeks, <2 days old) and mechanical cell detachment (without trypsin) yielded superior metaphase spreads.
• Repeated amniocentesis was needed in 28% of cases, more frequently with earlier gestational age or older specimens.
• Advanced maternal age and prior Down's syndrome history were common indications for amniocentesis, with the highest aberration rates in the advanced maternal age group.

Impact:

• Optimized methods improve the reliability of prenatal genetic screening.
• Refined techniques reduce the need for repeat procedures.
• Prenatal diagnosis, particularly karyotyping, is highly reliable, with minimal diagnostic errors noted in sex identification.