Journal
JOURNAL OF CLINICAL LABORATORY ANALYSIS
Volume 36, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/jcla.24660
Keywords
accuracy; chromosomal microdeletion; microduplication; chromosome aneuploidies; copy number variants; feasibility; noninvasive prenatal testing; sex chromosome abnormalities
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Funding
- National Key Research & Development Program of China [2016YFC1000703, 2016YFC1000700]
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This study evaluated the accuracy and feasibility of noninvasive prenatal testing (NIPT) according to different indications. The results showed that NIPT has high accuracy and specificity, and is effective in preventing birth defects, but cannot replace prenatal diagnosis.
BackgroundTo evaluate the accuracy and feasibility of noninvasive prenatal testing (NIPT) according to the results of NIPT and pregnancy outcomes with different indications. MethodsBetween October 2014 and December 2020, 20,626 pregnant women who received NIPT were included in this study. The positive predictive value (PPV) of trisomy 21, 18, and 13 (T21, T18, T13), sex chromosome abnormalities (SCAs), other chromosomal aneuploidies, and chromosomal microdeletion/microduplication were calculated. The positive results of NIPT were confirmed by amniocentesis, Karyotype analysis, and chromosome microarray analysis (CMA). ResultsIn total, 263 positive cases (263/20,626, 1.28%) were detected by NIPT, of which T21, T18, and T13 were 69, 26, and 9 cases, respectively. Sex chromosome abnormalities (SCAs), other chromosomal aneuploidies, and copy number variants (CNVs) were 69, 12, and 38 cases, respectively. There were true positive in 49 of T21, 13 of T18, 1 of T13, 32 of SCAs, 1 of other chromosomal aneuploidies, and 15 of CNVs. The NIPT sensitivity of T21, T18, T13, SCAs, other chromosomal aneuploidies, and CNVs was all 100%, the specialty was 99.90%, 99.94%, 99.96%, 99.82%, 99.95%, 99.89%, and the PPV was 71.01%, 50.00%, 11.11%, 46.38%, 8.33%, 39.47%, respectively. The PPV was high in T21, moderate in T18 and SCAs, and low in T13 and other chromosomal abnormalities. ConclusionNIPT has high accuracy, specificity and and can effectively avoid the occurrence of birth defects, but it cannot replace prenatal diagnosis. The accuracy, specificity, and sensitivity of NIPT in detecting sex chromosomes, chromosome microdeletion/microduplication, and other chromosomal abnormalities should be improved.
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