A new, non-invasive genetic test for Down syndrome and Edwards syndrome appears to be much more accurate than existing diagnostic methods, according to a new multicenter cohort study involving more than 4,000 women in the U.S., Netherlands and Sweden. Researchers found that the new assay, known as Digital Analysis of Selected Regions, was almost 100% accurate in screening for either of the aforementioned genetic disorders in a maternal blood sample. Similar tests analyze DNA from an entire genome, but the new assay only looks at the chromosomes under investigation. Details of the finding are published in the American Journal of Obstetrics and Gynecology. Release