Laboratory Medicine ›› 2023, Vol. 38 ›› Issue (6): 553-558.DOI: 10.3969/j.issn.1673-8640.2023.06.009

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Results of non-invasive prenatal testing-plus in 5 696 pregnant women

ZHANG Chu, WANG Jianhong(), LI Rui, XIAO Yanhua, WANG Heng, ZHANG Pinxiao, XU Ningxin, XIA Banban   

  1. Genetic and Prenatal Diagnosis Center,Maternal and Child Health Hospital of Jiaozuo,Key Laboratory of Prenatal Diagnosis Medicine of Jiaozuo,Jiaozuo 454000,Henan,China
  • Received:2022-04-04 Revised:2022-08-03 Online:2023-06-30 Published:2023-08-22

Abstract:

Objective To investigate the value of non-invasive prenatal testing-plus(NIPT-plus) in prenatal screening. Methods The results of NIPT-plus,interventional prenatal diagnosis and follow-up outcome in 5 696 pregnant women in Maternal and Child Health Hospital of Jiaozuo from December 2019 to June 2021 were analyzed to study the status of NIPT-plus on detecting chromosome aneuploidy and copy number variation(CNV). Results Totally,5 685 cases were determined among the 5 696 pregnant women,and the determination rate of high-risk in chromosomal abnormality was 2.60%(148/5 685) by NIPT-plus. NIPT-plus had higher positive predictive values on 21-trisomy and 18-trisomy(65.22% and 66.67%) than sex chromosome abnormality high-risk(25.00%)and chromosome microdeletions/microduplications(26.83%). The consistency rates of the results of microdeletions and microduplications in NIPT-plus and prenatal diagnosis were 43.75%(7/16)and 40.00%(10/25),respectively. The rate of pregnancy termination in microdeletion pregnant women was higher than that in microduplication pregnant women. Conclusions NIPT-plus has high positive predictive value in screening 21-trisomy and 18-trisomy. There is a low positive predictive value for sex chromosome abnormality and CNV by NIPT-plus. It is necessary to combine the results of interventional prenatal diagnosis. When necessary,CNV diagnosed by prenatal diagnosis should verify the source in order to provide correct genetic counseling for pregnant women.

Key words: Non-invasive prenatal testing-plus, Prenatal screening, Chromosome, Copy number variation, Prenatal diagnosis

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