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Am J Obstet Gynecol. 2012 Nov;207(5):374.e1-6. doi: 10.1016/j.ajog.2012.08.033. Epub 2012 Sep 19.

Noninvasive prenatal testing for fetal trisomies in a routinely screened first-trimester population.

Author information

1
Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, King's College, London, England, UK.

Abstract

OBJECTIVE:

We sought to assess performance of noninvasive prenatal testing for fetal trisomy in a routinely screened first-trimester pregnancy population.

STUDY DESIGN:

This was a cohort study of 2049 pregnant women undergoing routine screening for aneuploidies at 11-13 weeks' gestation. Plasma cell-free DNA analysis using chromosome-selective sequencing was used. Laboratory testing on a single plasma sample of 2 mL was carried out blindly and results were provided as risk score (%) for trisomies 21 and 18.

RESULTS:

Trisomy risk scores were given for 95.1% (1949 of 2049) of cases including all 8 with trisomy 21 and 2 of the 3 with trisomy 18. The trisomy risk score was >99% in the 8 cases of trisomy 21 and 2 of trisomy 18 and <1% in 99.9% (1937 of 1939) of euploid cases.

CONCLUSION:

Noninvasive prenatal testing using chromosome-selective sequencing in a routinely screened population identified trisomies 21 and 18 with a false-positive rate of 0.1%.

PMID:
23107079
DOI:
10.1016/j.ajog.2012.08.033
[Indexed for MEDLINE]

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