PATIENTS AND METHODS
The First And Second Trimester Evaluation of Risk (FASTER) trial, a National Institute of Child Health and Human Development–sponsored study, is a prospective multicenter investigation of singleton pregnancies enrolled from an unselected obstetric population. The study was undertaken from 1999 to 2002 and was approved by the institutional review boards at each of the participating centers. The study provided noninvasive assessment of Down syndrome risk using evaluation of first trimester nuchal translucency sonography, together with first and second trimester serum markers. A database was created containing detailed antenatal, birth, and pediatric outcomes on all enrolled patients.