How accurate is 10 and 12 week ultrasound had 2 that coincided with each other the 10 week 2 weeks later the 12 week and they added up can ultrasounds be off by 4-5weeks?

Answer 1

I have been doing a lot of research on the early ultrasounds. I have a 4 1/2 year old, she was born a day before her given due date. I had an early scan with her. I am now 25 weeks pregnant. I had an 8 week scan and from my research i have gathered that the early ultrasounds are very accurate. there is no mistake between a 7, 8, 9 10, week fetus. They all grow at the same rate until around 12 weeks or more. The best way to tell if your due date is accurate is to see how the dates match up with later ultrasounds. I had one at 8 weeks, 10 weeks and 19 weeks. My due dates added up within +/- 3 or 4 days. I was told that based on my 8 weeks scan i was due august 12th and i conceived on the 20th of November GIVE OR TAKE 3 DAYS. all of my dates have added up so far so i would trust the early scan you had. The only reason a scan might be off considerably would be due to an abnormality or a problem with the babys growth development. I would have to say that no, an early scan would never be off by 4 to 5 weeks unless the baby had died and it was a missed miscarriage but that would be very noticeable as well. so i would say it is almost impossible for a scan to be off by that much, I'm sure it has happened though! life is funny that way. I hope this helped