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Specifying a Gold Standard for the Validation of Fetal Fraction Estimation in Prenatal Screening.
BACKGROUND: An estimate of fetal fraction (FF) is needed for DNA-based screening for trisomy 21 and other aneuploidies, but there is no gold standard to validate FF measurement methods. We specify a gold standard and use ...
Prenatal reflex DNA screening for trisomies 21, 18, and 13.
PURPOSE: The purpose of the study was to determine the screening performance of prenatal reflex DNA screening for trisomies 21 (T21), 18 (T18), and 13 (T13) as part of a routine service at five hospitals. METHODS: Women ...
Response to Walker.