HELP needed to find NT scan in California

Denmark HELP NT scan

We are a family from Denmark, and we will spend the next 3 weeks traveling around California in a Camper.

Unfortunately the period is exactly our window for a NT scan, and we will therefore need to have this done here, instead of in Denmark. 

Our problem is that we dont know where to look and what to look for. Can anyone help us. We need to know who does NT scans, is that hospitals or private clinics? What is the name for a place that does NT scan and how can we find it?

Any help will be highly appreciated.

With warm greetings and thoughts from Denmark.

 Pernilla and Morten