How accurate are dating scans at 17 weeks

NICE recommends it's done between 10 weeks and 13 weeks.

There are two routine scans in pregnancy and the first is called the 12-week scan or “dating” scan – this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date.But if thin patient, experienced operator of the ultrasound and good views it can be very accurate. You can see early fetal anatomy much better vaginally though. Read more See 1 more doctor answer 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. Read more See 1 more doctor answer The most accurate ultrasounds for dating a pregnancy are those done in the 1st trimester, which both of these scans were.Otherwise, you might want to check the dates you provided. Read more First trimester ultrasound is accurate within 5-7 days. There is no test that can date conception more accurately than a 1 week window. 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! This will give you a more precise estimated due date.Are you expecting just one baby, or could it be twins or (gulp) even more?

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First trimester ultrasound is most accurate at estimating gestational age within 5-7 days (depends on the center). General rule: 2nd trimester scans for dating are /- 14 days and 3rd trimester is the least accurate ( /-21 days). Read more See 1 more doctor answer An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body.

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