It is now six months later. Mrs. Abbott has conceived and is now in her 11th week (gestational age estimated at 11 weeks, 3 days). She is seeing Dr. Thomas for the third time in her pregnancy. As was outlined in their discussion in Lesson 1, Dr. Thomas offered a diagnostic or confirmatory test (chorionic villus sampling or amniocentesis). Mrs. Abbott first elected to have a screening test, in this case the first trimester screening test of nuchal translucency in conjunction with serum protein analytes. They will discuss the results of the screening during this visit. Mr. Abbott has accompanied Mrs. Abbott to this visit.