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The stability of free-β human chorionic gonadotrophin and pregnancy-associated plasma protein-A in first trimester dried blood spots |
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| Authors: | Nicholas J Cowans Anastasia Stamatopoulou Paivi Liitti Mikko Suonpaa Kevin Spencer |
| Institution: | 1. Prenatal Screening Unit, Department of Clinical Biochemistry, King George Hospital, Barley Lane, Goodmayes, Essex, UK;2. PerkinElmer, Turku, Finland |
| Abstract: | |
| Keywords: | dried blood spots trisomy 21 fetal aneuploidy PAPP-A free-beta hCG |