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Screening for trisomy 21 in twin pregnancies in the first trimester: an update of the impact of chorionicity on maternal serum markers |
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| Authors: | Kevin Spencer Karl O Kagan Kypros H Nicolaides |
| Institution: | 1. Prenatal Screening Unit, Clinical Biochemistry Department, King George Hospital, Goodmayes, IG3 8YB, UK;2. Harris Birthright Research Centre for Fetal Medicine, Kings College Hospital, London
Department of Obstetrics and Gynecology, University of Tuebingen, Germany;3. Harris Birthright Research Centre for Fetal Medicine, Kings College Hospital, London |
| Abstract: | |
| Keywords: | PAPP-A free β-hCG prenatal screening twins Down syndrome |