There is a 12 day difference in due dates ultrasound confirms an earlier date and LMP is a later date Which is more accurate?
I go by the LMP, but even then I had mine early.
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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 week…s. 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.
Answer . \nYour due date is always based off of the first day of your last period, regardless of whether you are on the pill or not. For example, if period was 5/9/06 as …day one, your due date would be 2/12/07.
Answer . 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). ANSWER . 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.
Is it more accurate if your doctor gave you a due date of February 18 and said you were 21 weeks pregnant but an ultrasound showed you were 20 weeks and had a due date of February 25?
Answer . You may have had a longer cycle and become pregnant a little later than you thought. There is only a week between these 2 dates so it is not enough to worry about….\n. \nwith my first pregnancy, my dates said I was due on September 23rd and my scan said October 4th. I knew I had intercourse on January second, so I guess it just took a while to implant. \n. \nI didn't get a positive pregnancy test until February 3rd, which would be about right.\n. \nSecond time round my dates and scan were the same and I had a positive test on the day after my missed period.\n. \nThe only time it really matters is if you had sex with 2 men a week apart and need a best guess as to which is the father.
Answer . Yes, During an ultra sound they measure the length of the baby, the limbs if visible, head circumference etc.. then calculate an expected delivery date.\n. \n …Answer \n. \nAn ultrasound is accurate to within a couple of days if done at 8 weeks. At 20 weeks it is accurate to within a week.\n. \nAfter this babies grow at such diffeerent rates that it becomes increasingly less accurate.
My wife told her doctor she didn't know when her last mp was, so he sent her for an ultrasound! She lied, we just wanted 2 get an early ultrasound, and it was exact 2 the day …and that was at 5 weeks 4 days! Our 1st baby measured within 5 days thru the entire pregnancy, and that was as early as 8 weeks and as late as 26!
You were told you conceived on one date by an ultrasound but your lmp tells a different story off by 7 days but than again your cycles are 24 days which is more accurate?
Answer . Hello.\n. \nI would go with the date the ultrasound gave you but ultrasound dates can be off by a few to 7 days.. Answer . \nBoth of them are right. \n. \n…You probably conceived somewhere between the two. Most women ovulate 14 days BEFORE the missed period, as you have a short cycle this would mean 10 days after your LMP which would account for 4 of the 7 days, and even early ultrasounds are only accurate to within 3 days.\n. \nThe exact date would only be important if there had been two different men, and even then you would need a paternity test as it would be impossible to tell with such close dates.
If you dont know your lmp and had ultrasound at 5 weeks 4 days how accurate are the dates they give you?
\n. \n Answer \n. \nvery accurate (within one or two days)- they tell this by several different things
What did i conceive if my due date is 3-12-08 and my cycles are 30-31 days long My lmp was 6607. Neg test on 630 and 704 but a positive on 707.?
If you are asking if you are pregnant I would say 99.9% yes. You should check with your doctor to be certain and then set up your first appointment.
Your due date was July 21 2007 and you had your baby July 23 2007 you got your due date from your first ultrasound at 10 weeks How accurate was this ultrasound and when did you conceive?
Two days late is perfectly normal.. A date by ultrasound is only an estimate.
How do you figure out the approx date of conception based on your due date your due date is sept 18th your pregnancy is not consistent with your lmp your ultrasound was consistent with your due date?
The closest thought I have would be to go back 40weeks, then forward 2 weeks. This thought is based apon the fact of your aprox due date and taking it back to to what would ha…ve been the first day of your last period and then the 2 weeks forward would be roughly your ovulation time frame. I think that would be the best estimate you could ask for.\n. \nbtu who really cares!!\n. \n. \n. \n. \nfor an advanced algorithm take a look at www.redbabybook.com
When figuring the due date by a sonogram, the doctor will measure the crown-rump length (CRL). The length of the embryo on the longest axis constitutes the crown-rump lengt…h. This is actually considered to be the best parameters to date the embryo. The accuracy of it is plus or minus 3 to 5 days. A rough rule of thumb is that CRL + 6.5 = Menstrual Age in Weeks. That said, it doesn't matter what week the sonogram is taken to determine its accuracy, because it is based on the CRL measurement of the fetus. No matter what the length is (because it was done on different weeks of gestation) is will directly relate to the week of gestation and ultimately determine the EDD (estimated date of delivery). The EDD is just that, and educated guestimate (guess/estimate) and is not meant to be written in stone. When the due date has been set by an accurately measured CRL, it shouldn't be changed by a subsequent scan. If another scan done 6 to 8 weeks later says that you should have a new due date that is further away, they should not normally change the date. Instead, they should interpret this finding as that the baby is not growing at the expected rate. After more testing has been done to determine whether the baby is growing properly and there is no other cause for concern, then it is feasible that perhaps the original measurement of the CRL wasn't properly measured by the person operating the sonogram. In this case, the new date is the actual date (considering the new measurement had been measured properly). Keep in mind, however, when trying to figure your conception date that a full term pregnancy is considered to be 38-42 weeks, and that the accuracy of the sonogram being plus or minus 3-5 days. The date you actually give birth is directly related to the CRL and other factors of development of the fetus. Also, an egg doesn't become fertilized and implanted immediately after ejaculation. It can take up to 72 hours post-sex before that happens. By taking the due date you have been given, count back 40 weeks. The date you get is only a rough estimate of the date of conception. It could be off by about one week. The day you recall having sex should be within that week, either before or after the date you counted back to. Please note: This really gives you a two week timespan. Example: If the conception date you come up with is May 10 and you know you did not have sex that day, you could have potentially conceived that day (but that is kind of beside the point for the moment). You may have had sex anywhere from May 3 to May 10, or May 10 to May 17 and conceived up to 72 hours after you had sex in between May 3 to May 17.
Every ultrasound my due date changes but only a few days apart. I need to know exactly when I conceived because I was with more than one person and dont remember my lmp?
Due dates are only estimates... All you can do is count 38 weks back from the due date to get the best guess on when the baby was conceived.
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!
In the first 8 or 10 weeks, transvaginal ultrasound is very accurate, usually to within 2 or 3 days. After this time period, it becomes less accurate, varying up to 1 week if …the ultrasound is performed late in the 2nd or in the 3rd trimester.
Yes, the ultra sound measures the head and a forearm. Depending on the size is how they come up wth your conception date and due date. Your due date is typically 2 weeks bef…ore or even 2 weeks after. on a side note when I had mine done at 29 weeks they told me my first day of my last period was a month after! As if they'd know! This gave me a diffenrt estimate on both ends, putting me at 4 weeks off either way. we'll see......
Due date calculators are very useful in determining the approximate due date of a baby. Due date calculators use the date of the last menstrual period and calculates out 40 w…eeks to determine a due date. Most women give birth between 38 and 42 weeks, some due date calculators are great rough estimators of the time frame of birth.