Yes, extremely reliably, to the degree that Down syndrome has almost disappeared in societies with widespread prenatal screening [0]. [0] https://www.cbsnews.c

Yes, extremely reliably, to the degree that Down syndrome has almost disappeared in societies with widespread prenatal screening [0]. [0] https://www.cbsnews.com/amp/news/down-syndrome-iceland/ https://www.cbsnews.com/amp/news/down-syndrome-iceland/