A 26-year-old G1P0 in her 16th week gestation got a quad screen and had result suggesting a 1:50 risk for Down syndrome. You perform an ultrasound that places the fetus currently at 15wks and 5 days gestation. You should counsel which of the following?
The patient had a high risk result in the screening test and hence a diagnostic test should be performed. The best procedure at this gestational age is an amniocentesis which will assess the fetal karytotype and also the genetic make up.