How accurate is ultrasound pregnancy dating

May 23, How accurate is a pregnancy ultrasound? You may be wondering this about your due date, your baby's gender or more serious things like a.
Table of contents

• Ultrasound: Sonogram
• What types of ultrasound are there?
• How is an ultrasound performed?
• Ultrasound: Sonogram - American Pregnancy Association
• How accurate is the Estimated Due Date by ultrasound?

My doctor told me that the baby has to measure 10 days ahead of what the baby is supposed to be measuring gestational wise at the time based on your LMP in order for them to change the EDD.

I asked my dr at my last appt if my edd would change if baby measured big or small at my us next month. She said an early us is much more accurate than a 20 wk us, more accurate than lmp. I was told I was 8 weeks..

I will know soon how far a long I am. I'm guessing 17 weeks. I went to the health dept and they said I got pregnant in Dec and I know that was not possible because I wasn't feeling the symptoms until at least mid Feb. I guess its just one of those things that you just know. But then my boyfriend was a huge baby hes 6'4'' now so i could have a huge baby.

What types of ultrasound are there?

I am worried about the HUGE baby too, he is 6' Most drs wont change a due date after 20wks if the baby measures bigger, they will just say your having a big baby. I'd say the earlier ones probably are a little more accurate. The one I had a few weeks later was still only days earlier. I had one a little over a week ago that put our baby as being 6 days earlier than the original EDD.

I wouldn't be surprised if we go in next week and are told that we're a tad earlier still. DH and I are both fairly tall and if genetics reallys starts kicking in later on, our baby could just be "taller" than average without being "older. The earlier the US the more accurate it is.

But the anatomy scan it could show something different since babies grow at different rates but you should still go by the 1st ones date. And the later the US the more inaccurate it can get too. I know I had one a month before my due date because I changed hospitals and they didn't have all my records so didn't have my 20 week scan and they told me that the baby was almost 8 lbs at that time so I would prolly have a 9 lb baby My EDD's by ultrasound were pretty accurate. My daughter was born two days early and my son was born two days late.

How is an ultrasound performed?

Ok, now follow this if you can- My daughter was due on the 18th and was born on the 16th, my son was due on the 16th and born on the 18th! Archived Discussion This discussion is archived and locked for posting See active discussions on October Babies. T How accurate is the Estimated Due Date by ultrasound? Then at the week scan I got an EDD of 15 march, so that early scan was completely out.

Well, you'd think so, wouldn't you.

At around 12 weeks you can get more accurate measurements. By talking to the health care professionals you should get a clearer picture as to what is happening. Thanks so much for your post — we always welcome feedback, positive or negative, as we always aim to make our articles as accurate and as helpful as possible.

We spent a lot of time talking to sonographers before writing this article, so we're surprised that you think what they're saying is not in line with what you have studied. We'd be really keen to know more about your studies — and what you have learned. You're right that we did include 'anecdotal stories' in our article. We used them to illustrate the key points we were making in the articles but the quotes we used were all centred on the real experiences of pregnant women posting in our forum.

We are confident that we are not using these quotes to 'misinform women', as the key points in our article were all sourced from expert monographers.

It's interesting that you say that ultrasounds between 8 and 10 weeks are the most accurate. In the UK, most pregnant women don't have an ultrasound until they are at least 12 weeks pregnant. Perhaps you are based in the US, or another country, where ultrasound practice is a bit different? We use cookies to improve your experience of our website. Skip to main content.

Find us on YouTube Twitter Pinterest. Can your pregnancy scan give the wrong due date?

Some of the information in this article disagrees with everything we have studied so far regarding dating pregnancies and ultrasound accuracy. An ultrasound between weeks is the most accurate, not Please do not misinform women on anectodal stories. Do drop us a line a bout your studies, please. We'd be really interested to hear more.

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