How accurate is a dating scan Dating scan accuracy?!

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Join Date Jan Posts 1, Hi Guys, I need your help please. Instead of being due on the 27th DecemberI am now due on the 18th December. Looking at the scan and where the sonographer took the measurements you can see he didn't include the baby's head in the measurements.

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But with my 2 boys it was always a little ahead. My date based on LMP is 5 days earlier than on dating scan.

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I had one embryo with fetal pole and heartbeat and one blighted ovum. Unfortunatly made a mistake and had a one night stand on the 5th of July.

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Not sure how much with my eldest jack but i know with olly my EDD was 25th july they put me at 20th. My mother and I have always been close, but now that I have a baby, she has not helped out as much as I thought she would. Please do nose around, sign up and join in. I was sent to EPU as was being very sick.

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Introduction to antenatal screening tests. US of A Posts: Top 20 girls' names Top 20 boys' names Baby name trends revealed Girls' names on the up? I ended up going into labour at 38 weeks 2 weeks before EDD and learnt quickly that the baby has little regard for estimated dates or external hospital agendas.

The sonographers explained that the earlier the scan the more accurate as the embryo has very standard development.

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I knew when I OVd and had my due date down for 25th Jan. Everything ties in with my dates first day of last period, date of ovulation test, date of getting jiggy!

BUT they state at my hosp that if its less than a week difference then they dont change your EDD a it may how accurate is a dating scan be growth spurt etc.

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Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. Page 1 of 2. So it just goes to show how we cant reall y know for sure about Ov'ing etc I would expect a 13 week fetus to be significantly bigger than an 11 week one. Your baby is just as likely to arrive 10 days before or 10 days after its E DD.

Pregnancy — screening tests. At the end of the day - EDD is just a guide.