<prompt> The best time to do chorionic villous sampling is:Between 6-8 weeksBetween 7-9 weeksBetween 9-11 weeksBetween 11-13 weeks  <response>: Chorionic villus sampling prenatal diagnosis of genetic disorders transcervical done:at 10-12 weeks transabdominal done from 10 weeks to term diagnosis can be obtained by 24 hours complications like fetal loss,oromandibular limb deformities,vaginal bleeding are higher D.C.DUTTAS TEXTBOOK OF OBSTETRICS,Pg no:107,7th edition 