Hi Joanna, I second Kate's view. I ended up seeing several geneticist's due to a chromosome problem with my first bubba and found all of them to be wonderful. As Kate said, major women's hospitals have them and I am sure they would be happy to see you to discuss a plan. I am going to a different hosp with this pg and was recommended to see their geneticist and form a plan, which was really helpful & reasurring. You can have a CVS from 12-wks & an amnio from 16-wks (I had both - unusual situation), results usually take 24-48 hrs for the main chromosomes they test, but you'd need to check for HD. I don't know much about HD, but it may be worth asking if there are any 'markers' that will show in the NT scan. All the very best.