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Is there ever a time when a transvaginal ultrasound is truly necessary over a regular on-the-belly one? Back when I was a fertility patient I thought I'd received about every invasive procedure you could imagine, yet I'd never even heard of a transvaginal ultrasound until the last year or two, in conjunction with this new nonsense requiring women to get one before an abortion. I suppose logically you could guess that it produces better images, but really, when you consider the anatomy, there seems to be more tissue between the vagina and the baby--like the whole cervix on the bottom, and intestines towards the back--compared to the relatively thin outer abdominal wall. Development of the fetus doesn't seem like it should matter either: they can see a little fertilized egg with a regular ultrasound at even 6 weeks.
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