Karen D. Boucher

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OBJECTIVE The aim of this study was to assess the concentration of the first and second trimester maternal serum markers in pregnancies with a vanishing twin. METHODS This is a retrospective case-control study of pregnancies screened for Down syndrome in one Ontario center. Singleton pregnancies with ultrasound evidence of a vanishing twin were(More)
OBJECTIVE To investigate the association of Down syndrome screening results in successive pregnancies, and assess the impacts of including previous screening results in the current risk estimation on screening performance. METHODS The study was based on 56,951 women who had triple marker screening in two or more singleton pregnancies in the Ontario(More)
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