In rural Rwanda, in 2008, for the duration of the study you linked after jumping at the first cherry picked example that your Google search found, they were the most frequently made examination.
But even according to that article, out of the 345 examinations only 102 were pregnancy scans, making them a minority of all scans made.
> after jumping at the first cherry picked example that your Google search found
This was not cherry picked. It was the only one I could find. Feel free to provide better data since you were so sure...
> out of the 345 examinations only 102 were pregnancy scans, making them a minority of all scans made.
I knew you would say that. While this is mathematically that's clearly not what you were implying by saying it is a minority of scans.
I said "it's mostly used for pregnancies". The data supports that, not you.