Diagnostic utility of microarray testing in pregnancy loss.

Area of Science:

• Reproductive Medicine
• Genetics
• Prenatal Diagnostics

Background:

• Pregnancy loss is a significant concern, often with an underlying genetic etiology.
• Traditional cytogenetic analysis has limitations in detecting all chromosomal abnormalities in fetal demise specimens.

Purpose of the Study:

• To assess the frequency of clinically significant chromosomal abnormalities in pregnancy losses using chromosomal microarray.
• To compare the diagnostic performance of chromosomal microarray with traditional cytogenetic analysis for pregnancy loss.

Main Methods:

• Clinical chromosomal microarray-based comparative genomic hybridization (aCGH) was performed on 515 fetal demise specimens.
• Single nucleotide polymorphism (SNP) analysis was conducted on a subset of 107 specimens.
• Specimen data included gestational age and karyotype information.

Main Results:

• Clinically significant chromosomal abnormalities were identified in 12.8% of specimens with normal or unknown karyotypes.
• Detection rates of abnormalities were higher in earlier gestational ages.
• Chromosomal microarray demonstrated a lower failure rate (8.3%) compared to traditional cytogenetic analysis.

Conclusions:

• Chromosomal microarray testing offers increased diagnostic utility in cases of pregnancy loss.
• It successfully identifies abnormalities even with normal karyotypes and provides results when traditional methods fail.
• Chromosomal microarray is a robust and preferable method for investigating genetic causes of pregnancy loss across all gestational ages.