<prompt> Transabdominal CVS can be done in:7-9 weeks11-13 weeks8-9 weeksdone before 10 weeks  <response>: chorionic villous sampling trancervical:done in 10-12 weeks transabdominal:10 weeks to term D.C.DUTTA;S TEXTBOOK OF OBSTETRICS,Pg no:107,7th edition 