<prompt> False about chorionic villi biopsy:strongly associated with faciomandibular defectsDone in 10-12 weeksRh immunoglobulin prophylaxis is necessaryDone to diagnose genetic disorders  <response>: Done in 10-12 weeks in transcervically done to diagnose genetic disorders Rh immunisation:Anti-Dimmunoglobulin 50 microgm IM should be administered following the procedure to a Rh negative woman. complications: oromandibular limb deformities,vaginal bleeding and fetal D.C.DUTTAS TEXTBOOK OF GYNECOLOGY,Pg no:107,7th edition 