Cytogenetic studies in fetal blood

Area of Science:

• Prenatal Diagnosis
• Cytogenetics
• Fetal Medicine

Background:

• Cytogenetic diagnosis is crucial for identifying fetal chromosomal abnormalities.
• Traditional methods like amniocentesis have limitations in speed and applicability.
• Fetal blood sampling offers a potential alternative for rapid karyotyping.

Purpose of the Study:

• To evaluate the effectiveness and reliability of cytogenetic diagnosis using fetal blood.
• To assess the diagnostic success rate and accuracy of fetal blood karyotyping.
• To determine the utility of fetal blood analysis in specific prenatal diagnostic scenarios.

Main Methods:

• Retrospective analysis of 186 fetal blood sampling cases for rapid karyotype.
• Sampling performed between 19-37 weeks of gestation.
• Comparison of results with phenotypic follow-up and previous cytogenetic studies.

Main Results:

• An overall diagnostic success rate of 98% was achieved, reaching 100% in the later study period.
• Chromosomal anomalies were detected in 16% of fetuses; this rate was significantly higher (50%) in fetuses with multiple malformations.
• Fetal blood analysis provided definitive results in cases with inconclusive amniotic fluid studies, with no discrepancies noted on follow-up.

Conclusions:

• Cytogenetic analysis of fetal blood is effective, rapid, and reliable for establishing fetal karyotype in selected cases.
• It is particularly valuable for confirming or clarifying results from other prenatal diagnostic methods.
• The study supports the use of fetal blood sampling for timely and accurate prenatal genetic assessment.