How accurate are dating scans at 17 weeks

Posted by / 09-Sep-2020 18:02

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Before the scan you will be asked to drink a lot of water and have a full bladder, as this puts the uterus in a better position to be scanned.

This can be something of an uncomfortable challenge if your sonographer has particularly long waiting times.

That said, there is some variable in the initial weeks. Au/services/pregnancy-ultrasound-5-17-weeks-dating-and-viability. the fact that these 2 ultrasounds agree means that you have very accurate dating.

8 wks is not necessarily more accurate for dating, but presence of a fetal pole and heart rate (which may not be seen at 6 wk) is more reassuring that the pregnancy is on track. Read more See 1 more doctor answer There has to be more to this story.

He or she may need to prod your belly a bit to “encourage” the baby into a suitable position.

Ob ultrasounds are thought to be most accurate early on. But, your OB may have better specific information here. Read more Ultrasound dating accuracy is best in the first trimester.

Get weekly insight into your baby and your body's development, with our pregnancy newsletter – from the symptoms to expect to supplements you should be taking.

The dating scan is usually done at some point between 8 weeks and 14 weeks pregnant.

However, the 6 week ultrasound might be more accurate in dating your conception.

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 An abdominal ultrasound at 11 weeks is just as accurate for dating as vaginal ( \- 1 wk) if the image quality is good.

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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.

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