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Maternal serum human chorionic gonadotrophin and pregnancy-associated plasma protein A in twin pregnancies in the first trimester |
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| Authors: | Marko Niemimaa Mikko Suonpää Seppo Heinonen Maija Seppälä Risto Bloigu Markku Ryynänen |
| Institution: | 1. Department of Obstetrics and Gynecology, Oulu University Hospital, Oulu, Finland;2. Wallac OY, Turku, Finland;3. Department of Obstetrics and Gynecology, Kuopio University Hospital, Kuopio, Finland |
| Abstract: | |
| Keywords: | Down syndrome twin pregnancy first trimester screening PAPP-A free β-hCG |