How accurate are early ultrasounds in dating pregnancy
"From then on he was smack bang on average size for babies EDD on 15 March.I wouldn’t take an early scan as read, as it’s not your official dating scan anyway.” Well, you'd think so, wouldn't you.
” Expert Jan Steward, who is director of Ultrasound Direct and Babybond, agrees that early scans carry a much greater risk of inaccuracy.“I was measured at 6 6 (6 weeks and 6 days) when I should have been 8 weeks.Measurements at such an early stage aren't accurate which is why they wait for 12 weeks to date you.Of course you have probably already used an online due date calculator.This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started (your LMP). It's because it gives a definite date for health professionals to work with.Had a pregnancy ultrasound that doesn't match your Estimated Due Date (EDD)?
MFM mums share their stories plus expert sonographers explain why it happens and what to do if you're told your due dates are wrong Listening to MFM mums, it's clear lots of you leave your scan with a nagging feeling that what you've been told that day doesn’t seem quite right.
The sonographer then said that I was only about 4.5 weeks [EDD 2 April].
Then at the 12-week scan I got an EDD of 15 march, so that early scan was completely out.
“Definitely agree that dates from early scans are not accurate.
Just half a millimetre at such an early stage can change your date by a week. "I fell over at ‘7’ weeks by my last menstrual period (EDD 18 March) and was sent for an early scan.
It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed!