Most accurate dating pregnancy ultrasound abusive dating facts

There is no test that can date conception more accurately than a 1 week window. First trimester ultrasound usually accurate to 3-5 days. So at 14 weeks I would doubt the dates would be 2w3d off.

Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant.Then I had intercourse with my current boyfriend on the 4, 18, 19, and 20 November and we don't use protection.I'm currently pregnant and the scan shows EDD 08/08/2017 and that I'm 26 5 days along.Either way ultrasounds have a 'fudge factor' of 1 to 2 weeks in determining accuracy. Read more Generally, transvag more accurate as you can get better views (usually). Read more It would seem that you would have to conceive on feb. If the question is of historical interest, I would need to know when the ultrasound was done. A 6 week ultrasound can sometimes be a little early, depending on the size of the crown-rump-lenth, so getting another one at 11 weeks is great! Read more 1st trimester US is accurate within 5-7 days so if it differs from your LMP due date by more than that then the US is used. That means the number is the "number of week pregnant" the woman is, on the day of her ultrasound.But if thin patient, experienced operator of the ultrasound and good views it can be very accurate. Otherwise, you might want to check the dates you provided. Read more First trimester ultrasound is accurate within 5-7 days.. Au/services/pregnancy-ultrasound-5-17-weeks-dating-and-viability. The fact that these 2 ultrasounds agree means that you have very accurate dating. Also if you are uncertain about your LMP, most OB's will use that early US. Read more 14 week ultrasound is on the cusp between first and 2nd trimester. (if the number did not already have the 2 weeks added on, then the number would be the "age of the fetus", which is 2 weeks less than the "number of weeks pregnant") ...

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The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.

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