Yeah Fee all careproviders have their own preferred way of doing things. I have always had my simple checking type ultrasounds done at my ob's office but my ob's have always referred to the specialist for my nuchal scan and morphology.
The scanning equipment is in my OB's office but he doesn't actually do the important scans. His wife is actually the person who does them (NT scan and morphology). I thought that was cute that his wife works there too.