20 week scan at C+W - full bladder needed?

[extremelychocolateymilkroll]

I've got my 20 week scan tomorrow and it seems as though some hospitals ask for a full bladder and others don't bother. Does anyone have experience of C+W? TIA

bump

No- at 20 weeks you won't need a full bladder.

I thought by 20 weeks the uterus is far enough up in the abdomen to get a clear picture.

I'd have a glass of water before you go in just in case.

Thanks for your replies.

My hospital never bothered about it, for the 12 week or the 20 week scan (or the 34 week one I had the other day). Maybe it depends on what machinery they have?

This probably too late - but no - I didn't need a full bladder.