Every provider is different and I would say it depends on factors such as who is doing your ultrasound (dedicated sonographer vs your OB), whether you are doing an integrated test that combines results from other screenings, and the quality of the scan itself. The baby could be uncooperative with the scan or they can’t get a good visual because of how full or empty your bladder is.

I’m part of a large provider that did an integrated screen. A sonographer didn’t give detailed results but said “baby looks great” and “the doctor will read your results”, which meant to me that she wasn’t allowed to make real calls on the risk of the baby having a chromosomal abnormality without a doctor. But her attitude suggested to me that she didn’t see anything glaringly obvious. Then a few days later I got the official results from the doctor who looked at the scan and my stats (and likely my NIPT), and made the call. The official results said I was low risk for having chromosomal abnormalities based on the scan.

During the NT scan itself, I stayed quiet and made sure to give the sonographer the focus she needed so she didn’t miss anything I paid attention to the numbers she was measuring for the NT— knowing generally what to look for at my stage of pregnancy but still also accepting that I had no idea how to really read these scans on my own.