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Replacing the combined test by cell-free DNA testing in screening for trisomies 21, 18 and 13: impact on the diagnosis of other chromosomal abnormalities.
Syngelaki A, Pergament E, Homfray T, Akolekar R, Nicolaides KH.
Fetal Diagn Ther 2014;35:174-84. pdf -
First-trimester contingent screening for trisomy 21 by biomarkers and maternal blood cell-free DNA testing.
Nicolaides KH, Wright D, Poon LC, Syngelaki A, Gil MM.
Ultrasound Obstet Gynecol 2013;42:41-50. pdf -
Prospective validation of first-trimester combined screening for trisomy 21.
Kagan KO, Etchegaray A, Zhou Y, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2009;34:14-8.