Nuchal Translucency- Part 2

Zeba • | m a r r i e d 💍❤️ 01/29/2013 | n e w y o r k 🗽 | 💙💙 baby z born on 03/07/2016
Has anyone gotten a part 2 done on the NT exam? I had the part 1 taken about 3 weeks ago and they told me that after a month they will do part 2. I remember the tech mentioning was checking the spine. But what exactly is part 2 of the NT exam if you have had it done?