# Accuracy of dating ultrasound at 6 weeks

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The sonographer explained that indicated that this was a twin pregnancy with only one twin viable and could explain the date confusion as I may have ovulated twice in one cycle. The fetal pole grows at a rate of about 1 mm a day, starting at the 6th week of gestational age. This gives an estimate of the weight and size of the fetus and is important when doing serial ultrasounds to monitor fetal growth. If you have concerns about transvaginal ultrasound, please discuss this with your sonographer before your ultrasound begins.\
&#x20;![accuracy of dating ultrasound at 6 weeks](http://2.bp.blogspot.com/-2dE6cpsfkx4/UOY2RshZk3I/AAAAAAAADsk/3X8rBZEolKM/s1600/6w0d_wfjm.jpg)\\

Edob and gives very + days of physicians to up. By 8 weeks gestation, your baby can usually be seen with transabdominal ultrasound. Transvaginal ultrasound diameter as it sounds like.\
&#x20;![accuracy of dating ultrasound at 6 weeks](http://www.amazingpregnancy-pictures.com/photopost/data/518/medium/Buby-11weeks6days.jpg)\\

**First Trimester / Dating Ultrasound** - Ultrasound dating of conception is not reliable for determining paternity because the ultrasound can be off by at least 5-7 days in early pregnancy. So how accurate is ultrasound?\
&#x20;![accuracy of dating ultrasound at 6 weeks](http://vestrum.com.au/graphics/slides/ultrasound/First%20Trimester%20Screening%20Scan.%20A%20baby%20at%2013%20weeks%20gestation.jpg)\\

On thursday I will be 30 weeks. I am measuring bigger, so i wasnt sure if the scan was off or if my belly is just. On thursday I will be 30 weeks. I am measuring bigger, so i wasnt sure if the scan was off or if my belly is just measuring big. Im so clueless when it comes to all of this. Thanks to all who answered before! Gestational age, determined in a first trimester ultrasound is extremely accurate. We all start accuracy of dating ultrasound at 6 weeks at the same growth rate. At kf time in pregnancy, there is very little difference in size between those fetuses who ultrimately will be large, average size, or small. As pregnancy continues, these genetic and constitutional differences in size become more important clinically. It is not possible, for example to separate a 20 week fetus who is large from a 21 week fetus of normal size, or a 22 week fetus who is small for its age. All three will measure as though they were 21 weeks. The accuracy of datinf in predicting gestational age gets worse as the pregnancy advances. By 20 weeks, ultrasound is accurate only to within plus or minus two weeks, and by the third trimester, its accuracy falls to accuracyy or minus 3 weeks. The due date estimated from the ultrasound is probably within two weeks of your actual due date, and there is a chance that it will continue to be your due date. Your 20-week ultrasound will give a more accurate due date. The first several weeks ultrsound hard to tell because there isn't much to look at, it is calculated usually then by size, shape, and presence or lack of heartbeat usually appears right around week 5. My due date went from June 21 to June 14 to June 5. I ended up having my daughter on May 25th but I was induced. Only one woman I know has given birth on her due date. It is always an estimate! Mine was pretty accurate my 10 week ultra sound age matched up perfectly with my 20 week ultra sound but the age can vary because the ultra sound. Mine was pretty accurate my 10 week ultra sound age matched up perfectly with my 20 week ultra sound but the age can vary because the ultra sound estimate gestation age by size of the baby and if you have a smaller or larger baby than average, it would cause accurcay gestation age to be a little off. My two ultra sounds and blood testing have all been within a few days of eachother. Asking costs 5 points and then choosing a best answer earns you 3 points! Uploaded video will be live after processing. Uploaded video will be live after processing.
