Objective: To describe genetic results from amniotic fluid in pregnant women with high-risk non-invasive prenatal testing at the National Hospital of Obstetrics and Gynecology.
Subjects and methods: A cross-sectional descriptive study was conducted on 303 pregnant women with high-risk non-invasive prenatal testing (NIPT) results who underwent amniocentesis at the National Hospital of Obstetrics and Gynecology.
Results: The mean maternal age was 31.02 ± 6.4 years. Most participants had a university education and conceived naturally. The majority underwent NIPT at private healthcare facilities, accounting for 84.8%. Among high-risk NIPT results for aneuploidy, trisomy 21 accounted for the highest proportion at 32.3%, followed by monosomy X at 17.5% and 47,XXY at 14.2%. Genetic analysis of amniotic fluid showed relatively high confirmed abnormality rates: 77.6% by karyotyping, 73.7% by QF-PCR, 68.1% by BOBS, and 25% by CMA/Array. Among the detected abnormalities, trisomy 21 remained the most common.
Conclusion: NIPT is valuable for screening chromosomal abnormalities, however high-risk cases should undergo amniocentesis for diagnostic confirmation before pregnancy management decisions are made.