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The performance of first-trimester biochemical screening for trisomy 21 is best at 9-10 weeks rather than at 7-8 or 11-14 weeks.
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D. Wright
Kevin Spencer
Kao K
Ultrasound in Obstetrics and Gynecology
University of Tübingen
Aarhus University Hospital
King's College Hospital
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Wright et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69dbd8d8e6ab964fb0837103 — DOI: https://doi.org/10.1002/uog.7755