False negative cytogenetic results following amniocentesis

Area of Science:

• Medical Genetics
• Prenatal Diagnostics
• Cytogenetics

Background:

• Amniocentesis is a common prenatal diagnostic procedure.
• Cytogenetic studies analyze chromosomes for abnormalities.
• Accurate prenatal diagnosis is crucial for pregnancy management.

Observation:

• Two cases presented with false-negative prenatal cytogenetic results following amniocentesis.
• Mothers continued pregnancies based on normal prenatal chromosome analysis.
• Neonatal testing revealed chromosomal abnormalities missed prenatally.

Findings:

• Prenatal cytogenetic analysis can produce false-negative results.
• Review of initial amniocentesis specimens confirmed discrepancies.
• Discordance between prenatal and neonatal cytogenetic findings occurred.

Implications:

• High suspicion for chromosomal abnormalities warrants questioning normal prenatal results.
• Neonatal cytogenetic analysis should be considered in specific cases.
• This highlights the importance of confirmatory testing when clinical suspicion is high.