Synergy of Total PLAC4 RNA Concentration and Measurement of the RNA Single-Nucleotide Polymorphism Allelic Ratio for the Noninvasive Prenatal Detection of Trisomy 21

N. B.Y Tsui, R Akolekar, R. W.K Chiu, K. C.K Chow, T. Y Leung, T. K Lau, K. H Nicolaides and Y.M. D. Lo

Clinical Chemistry 56 ( 1 ): 73 - 81 , 2010