Ultrasounds
Due Dates

How accurate are due dates predicted by ultrasounds?

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2008-03-15 07:45:10
2008-03-15 07:45:10

They are accurate within 2 or 3 days. But this does not mean that you will have the baby on your due date. Babies can be born any time between 37 and 42 weeks. That is what midwives are taught anyway. With my first my ultrasound said I was due 10 days after my period date but my husband had been away on a trip form the day after conception! Second time around the ultrasound agreed completely, and showed twins. (now 16) == Your last known period date or the date of conception is a better predictor....as all babies are different & you may have an extrememly large or an extremely small baby for it's gestational age, and when compared against babies in the "norm" the due date could be way off.

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Yes, I remember my last cycle and I estimated my own due date to be Aug.8 well when I had my ultra sound it said Aug.5 so if not very accurate its very close... Good luck.

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If you do not remember the date of your last period you can have an ultrasound to determine your due date. More than one ultrasound throughout your pregnancy may be required because ultrasounds are not always accurate. They could be out as little as a couple of days by a matter of weeks.

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It all depends. If you're doctor is going by the date of your last menstrual period, and you have irregular ones, then it could be quite a bit off. Also, implantation bleeding can be mistaken for a period as well. Ultrasounds in early pregnancy are accurate to a week or so. And a due date is just an estimate. Only 10 percent of women actually deliver on their due date.

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ultrasounds are a better judge, in an ultasound it measures the baby to see how big it is and then it is fed into a chart that will tell you when the due date is, the chart is based off of what size the baby should be at that week and day.

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Due dates are predicted based on your menstrual cycle so be sure to know when your last period was prior to using the calculator. WebMD will explain the formula for you.

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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

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They are almost accurate. I was told my baby girl was due on 9th March. She came on the 7th, but looked at least 1-2 weeks overdue. I knew when my last menstrual period was but according to the ultrasound dates it was different. I would say in some cases they are pretty accurate, but if you know when your last menstrual period was and when you had sex, your dates are better then the doctors.

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actually it is due to fall down tommorrow

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When they do an ultrasound, they measure the baby's head and that's how they determine how far along you are. So if your baby's head is smaller than average, then they would give you a farther due date; If it's bigger than average they would give you a closer due date. Please remember your due date is an estimated guess, not the actual date you will absolutely deliver It depends how much the difference is and at what stage you have the ultrasound. At six weeks ultrasounds are accurate to within 2-3 days, by 12 weeks they are accurate to within 4-5 days and by 20 weeks they are only accurate within 5-7 days.

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well anything is possible, but this is science. Ultrasounds are very accurate in the begining maybe 1 or 2 days, but not 2 weeks. FInd out you're due date and go check out www.webmd.com and they can calculate you're date of conception for you for free. God bless

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Ultrasounds measure the size of the fetus to predict a due date and are usually very accurate, within two weeks, so I would safely assume that it would not be off by five weeks. You can ask your doctor, it won't be the first time he or she has answered that question,I promise. Also it depends on when the U/S is. U/S before 12 weeks of pregnancy are very accurate, plus or minus 2 weeks. After that there are more varibles, babies grow at different rates so they are not as accurate.

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Can a ultrasound be accurate if its saying im now due 3 weeks later then they determined?

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You could but keep in mind that it could also very much change depending on how the baby is measuring at the midway ultrasound. Even then the due dates are just estimates!

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Possibly 15th July 2009. Due dates arent always 100% accurate but can give you a rough estimate of when you could expect the delivery of your baby and calculate when you may have concieved.

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It would probably not be accurate since it is testing for the hormone HCG and you should wait until your period is due in anther 2 weeks to test again for accurate results

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If it was created by a governmental agency, chances are it is accurate due to the fact that the government can't legally release false information.

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Yes they do usually if you have irregular periods so they can give you a due date. Normally you will get you're first one when you're baby is 12 weeks. GOOD LUCK


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