A clinical study of 4,400 women undergoing prenatal diagnosis showed that testing with chromosomal microarray analysis detected additional chromosomal deletions and duplications not detected by G-banded karyotype, which is the current standard of care for patients undergoing invasive prenatal testing. Microarray analysis provides a more comprehensive examination of a fetus’s DNA than karyotyping, which involves only visual analysis of the fetus’s chromosomes. The study included samples from…