Ultrasound: Sonogram

Dating scan

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User Name Remember Me? Aug 12th, Give or take how many days out can a 12 week ultrasound be? My 12 week scan put me like 9 days ahead of my date using lmp! When I checked against the date of conception it matched up with the scan date. When I se my ob in a few weeks I'll see what she thinks about officially changing my due date. From what I've heard,most often lmp accuraacy used because most don't know the date of conception but lmp is not as accurate.

Aug 13th, amber bar speed dating, I got pregnant utlrasound after a MC, no period inbetween. From what I know, they are more accurate than going by LMP, so you should be just fine! They will change your due date later if they feel like they need to. My doctor says he never goes by LMP dates and felt my 12 week scan was more accurate for dating than the 6 week so thats what he is going by.

LMP is only used until the dating scan as it's the best guess until they measure the baby. The scan measurements are supposed to be accurate to within a couple of days. Both pregnancies we were sure of the date the first time I was working away loads and this time hubby was working away, so we kinda only had the one opportunity lol!

With my daughter the LMP was definitely wrong as my periods were irregular and the scan told us the exact dates we had worked out ourselves. With this pregnancy however the scan dated conception 4 days BEFORE we dtd. I know the sperm can survive a few days so you can conceive later than the day you have sex but not earlier! My doctor calculates your LMP due date based on the actual amount of days in your cycle.

I have a 32 day cycle and by that, my LMP EDD was the 13th werks December and my 12 week scan gave me an EDD of 12th December, so I'd say its pretty darn accurate. With DD it gave me an EDD of a day before my LMP did so that was accurate. This time all I have to go by is the scan dates: My 12 wk scan put me a whole week ahead vs my lmp date. My lmp is good, because I was keeping track, but I truly don't know when I ovulated, so yeah The dating scan ultrasound dating accuracy 13 weeks be the most reliable, but end of the day you're talking maybe a maximum of 2 weeks discrepancy which is rare anyway and as a baby can come over a 5 week period there isn't a need to stress.

There was a really interesting article on the BBC about how some medical professionals think they ultrasound dating accuracy 13 weeks do away with the concept of uptrasound "due date" due to acuracy 5 week window. Thread Tools Show Printable Version Email this Page. Search this Thread Advanced Search. Trying to conceive - Ultrasound dating accuracy 13 weeks - Baby - Parenting - Sitemap - Search - Contact Us - Privacy Policy - Terms of Use - Forum Rules - Mobile - Clear Cookies AdChoices - Momtastic.

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